21210132012 has 24 divisors (see below), whose sum is σ = 50641246656. Its totient is φ = 6905624208.

The previous prime is 21210131989. The next prime is 21210132023. The reversal of 21210132012 is 21023101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210131982 and 21210132000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20551938 + ... + 20552969.

It is an arithmetic number, because the mean of its divisors is an integer number (2110051944).

Almost surely, 2^21210132012 is an apocalyptic number.

It is an amenable number.

21210132012 is an abundant number, since it is smaller than the sum of its proper divisors (29431114644).

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

21210132012 is a wasteful number, since it uses less digits than its factorization.

21210132012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41104957 (or 41104955 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210132012 its reverse (21023101212), we get a palindrome (42233233224).

The spelling of 21210132012 in words is "twenty-one billion, two hundred ten million, one hundred thirty-two thousand, twelve".