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1211200021001 = 8271464570763
BaseRepresentation
bin10001101000000001001…
…001011010001000001001
311021210022121112010110002
4101220001021122020021
5124321014201133001
62324230111532345
7153335444211335
oct21500111321011
94253277463402
101211200021001
114277379216a3
121768a452a0b5
138a2a5aa6079
144289dbc47c5
152178d0da46b
hex11a0125a209

1211200021001 has 4 divisors (see below), whose sum is σ = 1212664592592. Its totient is φ = 1209735449412.

The previous prime is 1211200020977. The next prime is 1211200021019. The reversal of 1211200021001 is 1001200021121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1211200021001 - 214 = 1211200004617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211200021301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732284555 + ... + 732286208.

It is an arithmetic number, because the mean of its divisors is an integer number (303166148148).

Almost surely, 21211200021001 is an apocalyptic number.

It is an amenable number.

1211200021001 is a deficient number, since it is larger than the sum of its proper divisors (1464571591).

1211200021001 is an equidigital number, since it uses as much as digits as its factorization.

1211200021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464571590.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1211200021001 its reverse (1001200021121), we get a palindrome (2212400042122).

The spelling of 1211200021001 in words is "one trillion, two hundred eleven billion, two hundred million, twenty-one thousand, one".

Divisors: 1 827 1464570763 1211200021001