21761997702 has 32 divisors (see below), whose sum is σ = 43788729600. Its totient is φ = 7210011168.

The previous prime is 21761997689. The next prime is 21761997731. The reversal of 21761997702 is 20779916712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644824 + ... + 677732.

It is an arithmetic number, because the mean of its divisors is an integer number (1368397800).

Almost surely, 2^21761997702 is an apocalyptic number.

21761997702 is an abundant number, since it is smaller than the sum of its proper divisors (22026731898).

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

21761997702 is a wasteful number, since it uses less digits than its factorization.

21761997702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33580.

The product of its (nonzero) digits is 666792, while the sum is 51.

The spelling of 21761997702 in words is "twenty-one billion, seven hundred sixty-one million, nine hundred ninety-seven thousand, seven hundred two".