21216020143144 has 32 divisors (see below), whose sum is σ = 40434485911200. Its totient is φ = 10433510493120.

The previous prime is 21216020143133. The next prime is 21216020143183. The reversal of 21216020143144 is 44134102061212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7341979 + ... + 9815125.

It is an arithmetic number, because the mean of its divisors is an integer number (1263577684725).

Almost surely, 2^{21216020143144} is an apocalyptic number.

It is an amenable number.

21216020143144 is a deficient number, since it is larger than the sum of its proper divisors (19218465768056).

21216020143144 is a wasteful number, since it uses less digits than its factorization.

21216020143144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490793 (or 2490789 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 21216020143144 in words is "twenty-one trillion, two hundred sixteen billion, twenty million, one hundred forty-three thousand, one hundred forty-four".