21002162708 has 6 divisors (see below), whose sum is σ = 36753784746. Its totient is φ = 10501081352.

The previous prime is 21002162683. The next prime is 21002162771. The reversal of 21002162708 is 80726120012.

It can be written as a sum of positive squares in only one way, i.e., 13536857104 + 7465305604 = 116348^2 + 86402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625270335 + ... + 2625270342.

It is an arithmetic number, because the mean of its divisors is an integer number (6125630791).

Almost surely, 2^21002162708 is an apocalyptic number.

It is an amenable number.

21002162708 is a deficient number, since it is larger than the sum of its proper divisors (15751622038).

21002162708 is a wasteful number, since it uses less digits than its factorization.

21002162708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250540681 (or 5250540679 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The spelling of 21002162708 in words is "twenty-one billion, two million, one hundred sixty-two thousand, seven hundred eight".