21022332012 has 36 divisors (see below), whose sum is σ = 57970674216. Its totient is φ = 6370403520.

The previous prime is 21022331999. The next prime is 21022332017. The reversal of 21022332012 is 21023322012.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (21022332017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26542953 + ... + 26543744.

It is an arithmetic number, because the mean of its divisors is an integer number (1610296506).

Almost surely, 2^21022332012 is an apocalyptic number.

21022332012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21022332012 is an abundant number, since it is smaller than the sum of its proper divisors (36948342204).

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

21022332012 is a wasteful number, since it uses less digits than its factorization.

21022332012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53086718 (or 53086713 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21022332012 its reverse (21023322012), we get a palindrome (42045654024).

The spelling of 21022332012 in words is "twenty-one billion, twenty-two million, three hundred thirty-two thousand, twelve".