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12010221221 = 31387426491
BaseRepresentation
bin10110010111101110…
…10110111010100101
31011000000100110020012
423023313112322211
5144044104034341
65303432420005
7603424124135
oct131367267245
934000313205
1012010221221
115103502a69
1223b2247605
131195302c9b
1481d11cac5
154a45de0eb
hex2cbdd6ea5

12010221221 has 4 divisors (see below), whose sum is σ = 12397647744. Its totient is φ = 11622794700.

The previous prime is 12010221203. The next prime is 12010221277. The reversal of 12010221221 is 12212201021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12212201021 = 64511893071.

It is a cyclic number.

It is not a de Polignac number, because 12010221221 - 222 = 12006026917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12010221196 and 12010221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12010229221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193713215 + ... + 193713276.

It is an arithmetic number, because the mean of its divisors is an integer number (3099411936).

Almost surely, 212010221221 is an apocalyptic number.

It is an amenable number.

12010221221 is a deficient number, since it is larger than the sum of its proper divisors (387426523).

12010221221 is an equidigital number, since it uses as much as digits as its factorization.

12010221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387426522.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12010221221 its reverse (12212201021), we get a palindrome (24222422242).

The spelling of 12010221221 in words is "twelve billion, ten million, two hundred twenty-one thousand, two hundred twenty-one".

Divisors: 1 31 387426491 12010221221