21031112032 has 216 divisors, whose sum is σ = 50488310880. Its totient is φ = 8596224000.

The previous prime is 21031111999. The next prime is 21031112051. The reversal of 21031112032 is 23021113012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21031111997 and 21031112015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 208228782 + ... + 208228882.

It is an arithmetic number, because the mean of its divisors is an integer number (233742180).

Almost surely, 2^21031112032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031112032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25244155440).

21031112032 is an abundant number, since it is smaller than the sum of its proper divisors (29457198848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031112032 is a wasteful number, since it uses less digits than its factorization.

21031112032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031112032 its reverse (23021113012), we get a palindrome (44052225044).

The spelling of 21031112032 in words is "twenty-one billion, thirty-one million, one hundred twelve thousand, thirty-two".