21164642203 has 8 divisors (see below), whose sum is σ = 22282286400. Its totient is φ = 20047369608.

The previous prime is 21164642173. The next prime is 21164642231. The reversal of 21164642203 is 30224646112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21164642203 - 2¹³ = 21164634011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21164642243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28068 + ... + 207646.

It is an arithmetic number, because the mean of its divisors is an integer number (2785285800).

Almost surely, 2^21164642203 is an apocalyptic number.

21164642203 is a deficient number, since it is larger than the sum of its proper divisors (1117644197).

21164642203 is a wasteful number, since it uses less digits than its factorization.

21164642203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185801.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 21164642203 in words is "twenty-one billion, one hundred sixty-four million, six hundred forty-two thousand, two hundred three".