21310020032 has 84 divisors (see below), whose sum is σ = 49247901504. Its totient is φ = 9122319360.

The previous prime is 21310020029. The next prime is 21310020107. The reversal of 21310020032 is 23002001312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21310019989 and 21310020016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3104348 + ... + 3111204.

Almost surely, 2^21310020032 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 21310020032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24623950752).

21310020032 is an abundant number, since it is smaller than the sum of its proper divisors (27937881472).

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

21310020032 is an equidigital number, since it uses as much as digits as its factorization.

21310020032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7874 (or 7857 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21310020032 its reverse (23002001312), we get a palindrome (44312021344).

The spelling of 21310020032 in words is "twenty-one billion, three hundred ten million, twenty thousand, thirty-two".