21959986762 has 16 divisors (see below), whose sum is σ = 37660521600. Its totient is φ = 9407715408.

The previous prime is 21959986733. The next prime is 21959986777. The reversal of 21959986762 is 26768995912.

It is a junction number, because it is equal to n+sod(n) for n = 21959986694 and 21959986703.

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, 271998 + ... + 343369.

It is an arithmetic number, because the mean of its divisors is an integer number (2353782600).

Almost surely, 2^21959986762 is an apocalyptic number.

21959986762 is a deficient number, since it is larger than the sum of its proper divisors (15700534838).

21959986762 is a wasteful number, since it uses less digits than its factorization.

21959986762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617925.

The product of its digits is 29393280, while the sum is 64.

The spelling of 21959986762 in words is "twenty-one billion, nine hundred fifty-nine million, nine hundred eighty-six thousand, seven hundred sixty-two".