21024111231 has 24 divisors (see below), whose sum is σ = 30473140880. Its totient is φ = 13967686656.

The previous prime is 21024111209. The next prime is 21024111307. The reversal of 21024111231 is 13211142012.

21024111231 is a `hidden beast` number, since 21 + 0 + 2 + 411 + 1 + 231 = 666.

It is not a de Polignac number, because 21024111231 - 2⁶ = 21024111167 is a prime.

It is a super-2 number, since 2×21024111231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024111631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7205985 + ... + 7208901.

Almost surely, 2^21024111231 is an apocalyptic number.

21024111231 is a deficient number, since it is larger than the sum of its proper divisors (9449029649).

21024111231 is a wasteful number, since it uses less digits than its factorization.

21024111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415 (or 5412 counting only the distinct ones).

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

Adding to 21024111231 its reverse (13211142012), we get a palindrome (34235253243).

The spelling of 21024111231 in words is "twenty-one billion, twenty-four million, one hundred eleven thousand, two hundred thirty-one".