21216020143163 has 24 divisors (see below), whose sum is σ = 21581060874240. Its totient is φ = 20856154754880.

The previous prime is 21216020143133. The next prime is 21216020143183. The reversal of 21216020143163 is 36134102061212.

It is a de Polignac number, because none of the positive numbers 2^k-21216020143163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21216020143133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 799414748 + ... + 799441286.

It is an arithmetic number, because the mean of its divisors is an integer number (899210869760).

Almost surely, 2^{21216020143163} is an apocalyptic number.

21216020143163 is a deficient number, since it is larger than the sum of its proper divisors (365040731077).

21216020143163 is a wasteful number, since it uses less digits than its factorization.

21216020143163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27227 (or 27090 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21216020143163 in words is "twenty-one trillion, two hundred sixteen billion, twenty million, one hundred forty-three thousand, one hundred sixty-three".