21032210052 has 72 divisors (see below), whose sum is σ = 62172766656. Its totient is φ = 5869450944.

The previous prime is 21032210047. The next prime is 21032210071. The reversal of 21032210052 is 25001223012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 959643 + ... + 981314.

It is an arithmetic number, because the mean of its divisors is an integer number (863510648).

Almost surely, 2^21032210052 is an apocalyptic number.

It is an amenable number.

21032210052 is an abundant number, since it is smaller than the sum of its proper divisors (41140556604).

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

21032210052 is a wasteful number, since it uses less digits than its factorization.

21032210052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941017 (or 1941012 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21032210052 its reverse (25001223012), we get a palindrome (46033433064).

The spelling of 21032210052 in words is "twenty-one billion, thirty-two million, two hundred ten thousand, fifty-two".