21002112201231 has 64 divisors (see below), whose sum is σ = 37862429952000. Its totient is φ = 11479415248224.

The previous prime is 21002112201223. The next prime is 21002112201281. The reversal of 21002112201231 is 13210221120012.

21002112201231 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 211 + 220 + 1 + 231 = 666.

It is not a de Polignac number, because 21002112201231 - 2³ = 21002112201223 is a prime.

It is a super-2 number, since 2×21002112201231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002112201281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49087036 + ... + 49513041.

It is an arithmetic number, because the mean of its divisors is an integer number (591600468000).

Almost surely, 2^{21002112201231} is an apocalyptic number.

21002112201231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21002112201231 is a deficient number, since it is larger than the sum of its proper divisors (16860317750769).

21002112201231 is an equidigital number, since it uses as much as digits as its factorization.

21002112201231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98600130 (or 98600110 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21002112201231 its reverse (13210221120012), we get a palindrome (34212333321243).

The spelling of 21002112201231 in words is "twenty-one trillion, two billion, one hundred twelve million, two hundred one thousand, two hundred thirty-one".