21642342846203 has 24 divisors (see below), whose sum is σ = 22564381687344. Its totient is φ = 20755658219520.

The previous prime is 21642342846181. The next prime is 21642342846209. The reversal of 21642342846203 is 30264824324612.

It is a happy number.

It is not a de Polignac number, because 21642342846203 - 2²⁰ = 21642341797627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21642342846209) 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, 1012401851 + ... + 1012423227.

It is an arithmetic number, because the mean of its divisors is an integer number (940182570306).

Almost surely, 2^{21642342846203} is an apocalyptic number.

21642342846203 is a deficient number, since it is larger than the sum of its proper divisors (922038841141).

21642342846203 is a wasteful number, since it uses less digits than its factorization.

21642342846203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30875 (or 30844 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 47.

The spelling of 21642342846203 in words is "twenty-one trillion, six hundred forty-two billion, three hundred forty-two million, eight hundred forty-six thousand, two hundred three".