21102011021231 has 16 divisors (see below), whose sum is σ = 24205184188416. Its totient is φ = 18020996189856.

The previous prime is 21102011021153. The next prime is 21102011021237. The reversal of 21102011021231 is 13212011020112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102011021231 is a prime.

It is a super-2 number, since 2×21102011021231² (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 (21102011021237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30932840 + ... + 31607666.

It is an arithmetic number, because the mean of its divisors is an integer number (1512824011776).

Almost surely, 2^{21102011021231} is an apocalyptic number.

21102011021231 is a deficient number, since it is larger than the sum of its proper divisors (3103173167185).

21102011021231 is a wasteful number, since it uses less digits than its factorization.

21102011021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691238.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21102011021231 its reverse (13212011020112), we get a palindrome (34314022041343).

The spelling of 21102011021231 in words is "twenty-one trillion, one hundred two billion, eleven million, twenty-one thousand, two hundred thirty-one".