21996507466 has 16 divisors (see below), whose sum is σ = 33303727368. Its totient is φ = 10895718400.

The previous prime is 21996507457. The next prime is 21996507487. The reversal of 21996507466 is 66470569912.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21880622241 + 115885225 = 147921^2 + 10765^2 .

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, 15895 + ... + 210346.

Almost surely, 2^21996507466 is an apocalyptic number.

21996507466 is a deficient number, since it is larger than the sum of its proper divisors (11307219902).

21996507466 is a wasteful number, since it uses less digits than its factorization.

21996507466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226697.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 21996507466 in words is "twenty-one billion, nine hundred ninety-six million, five hundred seven thousand, four hundred sixty-six".