21986502954 has 32 divisors (see below), whose sum is σ = 49847945280. Its totient is φ = 6409020672.

The previous prime is 21986502949. The next prime is 21986502977. The reversal of 21986502954 is 45920568912.

It is a super-2 number, since 2×21986502954² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21986502897 and 21986502906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7416367 + ... + 7419330.

It is an arithmetic number, because the mean of its divisors is an integer number (1557748290).

Almost surely, 2^21986502954 is an apocalyptic number.

21986502954 is an abundant number, since it is smaller than the sum of its proper divisors (27861442326).

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

21986502954 is a wasteful number, since it uses less digits than its factorization.

21986502954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14835734.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 21986502954 in words is "twenty-one billion, nine hundred eighty-six million, five hundred two thousand, nine hundred fifty-four".