21948372654 has 16 divisors (see below), whose sum is σ = 47273418192. Its totient is φ = 6753345408.

The previous prime is 21948372637. The next prime is 21948372661. The reversal of 21948372654 is 45627384912.

It is a junction number, because it is equal to n+sod(n) for n = 21948372597 and 21948372606.

It is a congruent 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, 140694619 + ... + 140694774.

It is an arithmetic number, because the mean of its divisors is an integer number (2954588637).

Almost surely, 2^21948372654 is an apocalyptic number.

21948372654 is an abundant number, since it is smaller than the sum of its proper divisors (25325045538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21948372654 is a wasteful number, since it uses less digits than its factorization.

21948372654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281389411.

The product of its digits is 2903040, while the sum is 51.

The spelling of 21948372654 in words is "twenty-one billion, nine hundred forty-eight million, three hundred seventy-two thousand, six hundred fifty-four".