21110133231 has 72 divisors (see below), whose sum is σ = 35567964432. Its totient is φ = 12014323200.

The previous prime is 21110133221. The next prime is 21110133269. The reversal of 21110133231 is 13233101112.

It is not a de Polignac number, because 21110133231 - 2¹¹ = 21110131183 is a prime.

It is a super-2 number, since 2×21110133231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110133221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10569925 + ... + 10571921.

It is an arithmetic number, because the mean of its divisors is an integer number (493999506).

Almost surely, 2^21110133231 is an apocalyptic number.

21110133231 is a deficient number, since it is larger than the sum of its proper divisors (14457831201).

21110133231 is a wasteful number, since it uses less digits than its factorization.

21110133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613 (or 2599 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21110133231 its reverse (13233101112), we get a palindrome (34343234343).

The spelling of 21110133231 in words is "twenty-one billion, one hundred ten million, one hundred thirty-three thousand, two hundred thirty-one".