21009774702 has 16 divisors (see below), whose sum is σ = 48022342272. Its totient is φ = 6002792760.

The previous prime is 21009774691. The next prime is 21009774727. The reversal of 21009774702 is 20747790012.

It is a congruent number.

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, 250116324 + ... + 250116407.

It is an arithmetic number, because the mean of its divisors is an integer number (3001396392).

Almost surely, 2^21009774702 is an apocalyptic number.

21009774702 is an abundant number, since it is smaller than the sum of its proper divisors (27012567570).

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

21009774702 is a wasteful number, since it uses less digits than its factorization.

21009774702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500232743.

The product of its (nonzero) digits is 49392, while the sum is 39.

The spelling of 21009774702 in words is "twenty-one billion, nine million, seven hundred seventy-four thousand, seven hundred two".