21531112022 has 32 divisors (see below), whose sum is σ = 37401067008. Its totient is φ = 9105647616.

The previous prime is 21531112021. The next prime is 21531112033. The reversal of 21531112022 is 22021113512.

It is a junction number, because it is equal to n+sod(n) for n = 21531111985 and 21531112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531112021) 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, 357023 + ... + 412949.

It is an arithmetic number, because the mean of its divisors is an integer number (1168783344).

Almost surely, 2^21531112022 is an apocalyptic number.

21531112022 is a deficient number, since it is larger than the sum of its proper divisors (15869954986).

21531112022 is a wasteful number, since it uses less digits than its factorization.

21531112022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56300.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21531112022 its reverse (22021113512), we get a palindrome (43552225534).

The spelling of 21531112022 in words is "twenty-one billion, five hundred thirty-one million, one hundred twelve thousand, twenty-two".