21993607290 has 32 divisors (see below), whose sum is σ = 52807962816. Its totient is φ = 5862372480.

The previous prime is 21993607289. The next prime is 21993607313. The reversal of 21993607290 is 9270639912.

It is a super-2 number, since 2×21993607290² (a number of 21 digits) contains 22 as substring.

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, 92272 + ... + 229131.

It is an arithmetic number, because the mean of its divisors is an integer number (1650248838).

Almost surely, 2^21993607290 is an apocalyptic number.

21993607290 is an abundant number, since it is smaller than the sum of its proper divisors (30814355526).

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

21993607290 is a wasteful number, since it uses less digits than its factorization.

21993607290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323694.

The product of its (nonzero) digits is 367416, while the sum is 48.

The spelling of 21993607290 in words is "twenty-one billion, nine hundred ninety-three million, six hundred seven thousand, two hundred ninety".