21642007203 has 6 divisors (see below), whose sum is σ = 31260677084. Its totient is φ = 14428004796.

The previous prime is 21642007193. The next prime is 21642007207. The reversal of 21642007203 is 30270024612.

21642007203 is a `hidden beast` number, since 216 + 420 + 0 + 7 + 20 + 3 = 666.

It is not a de Polignac number, because 21642007203 - 2²¹ = 21639910051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21642007207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1202333725 + ... + 1202333742.

Almost surely, 2^21642007203 is an apocalyptic number.

21642007203 is a deficient number, since it is larger than the sum of its proper divisors (9618669881).

21642007203 is a wasteful number, since it uses less digits than its factorization.

21642007203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404667473 (or 2404667470 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The spelling of 21642007203 in words is "twenty-one billion, six hundred forty-two million, seven thousand, two hundred three".