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1221222201211 = 6718227197033
BaseRepresentation
bin10001110001010110100…
…000111111011101111011
311022202012002000122002201
4101301112200333131323
5130002030340414321
62333004410011031
7154142011302535
oct21612640773573
94282162018081
101221222201211
11430a10105a61
12178820a16a77
138b21225b10c
1443170c7c855
1521b77dca291
hex11c5683f77b

1221222201211 has 4 divisors (see below), whose sum is σ = 1239449398312. Its totient is φ = 1202995004112.

The previous prime is 1221222201191. The next prime is 1221222201217. The reversal of 1221222201211 is 1121022221221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221222201211 - 215 = 1221222168443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221222201217) 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, 9113598450 + ... + 9113598583.

It is an arithmetic number, because the mean of its divisors is an integer number (309862349578).

Almost surely, 21221222201211 is an apocalyptic number.

1221222201211 is a deficient number, since it is larger than the sum of its proper divisors (18227197101).

1221222201211 is an equidigital number, since it uses as much as digits as its factorization.

1221222201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18227197100.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221222201211 its reverse (1121022221221), we get a palindrome (2342244422432).

The spelling of 1221222201211 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred eleven".

Divisors: 1 67 18227197033 1221222201211