21654262236 has 24 divisors (see below), whose sum is σ = 51026878224. Its totient is φ = 7146620800.

The previous prime is 21654262229. The next prime is 21654262241. The reversal of 21654262236 is 63226245612.

It is a junction number, because it is equal to n+sod(n) for n = 21654262194 and 21654262203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8932065 + ... + 8934488.

It is an arithmetic number, because the mean of its divisors is an integer number (2126119926).

Almost surely, 2^21654262236 is an apocalyptic number.

It is an amenable number.

21654262236 is an abundant number, since it is smaller than the sum of its proper divisors (29372615988).

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

21654262236 is a wasteful number, since it uses less digits than its factorization.

21654262236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17866661 (or 17866659 counting only the distinct ones).

The product of its digits is 207360, while the sum is 39.

The spelling of 21654262236 in words is "twenty-one billion, six hundred fifty-four million, two hundred sixty-two thousand, two hundred thirty-six".