21986386952 has 16 divisors (see below), whose sum is σ = 41227004160. Its totient is φ = 10992519184.

The previous prime is 21986386927. The next prime is 21986386963. The reversal of 21986386952 is 25968368912.

It is a super-2 number, since 2×21986386952² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21986386891 and 21986386900.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71153 + ... + 221439.

It is an arithmetic number, because the mean of its divisors is an integer number (2576687760).

Almost surely, 2^21986386952 is an apocalyptic number.

It is an amenable number.

21986386952 is a deficient number, since it is larger than the sum of its proper divisors (19240617208).

21986386952 is a wasteful number, since it uses less digits than its factorization.

21986386952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168580 (or 168576 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 59.

The spelling of 21986386952 in words is "twenty-one billion, nine hundred eighty-six million, three hundred eighty-six thousand, nine hundred fifty-two".