21223132012 has 12 divisors (see below), whose sum is σ = 39095243320. Its totient is φ = 10053062496.

The previous prime is 21223131983. The next prime is 21223132019. The reversal of 21223132012 is 21023132212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21223132019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139625793 + ... + 139625944.

Almost surely, 2^21223132012 is an apocalyptic number.

It is an amenable number.

21223132012 is a deficient number, since it is larger than the sum of its proper divisors (17872111308).

21223132012 is a wasteful number, since it uses less digits than its factorization.

21223132012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279251760 (or 279251758 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21223132012 its reverse (21023132212), we get a palindrome (42246264224).

The spelling of 21223132012 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, twelve".