21700005278 has 16 divisors (see below), whose sum is σ = 37216917504. Its totient is φ = 9295775160.

The previous prime is 21700005227. The next prime is 21700005281. The reversal of 21700005278 is 87250000712.

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, 320258 + ... + 382053.

It is an arithmetic number, because the mean of its divisors is an integer number (2326057344).

Almost surely, 2^21700005278 is an apocalyptic number.

21700005278 is a deficient number, since it is larger than the sum of its proper divisors (15516912226).

21700005278 is a wasteful number, since it uses less digits than its factorization.

21700005278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704527.

The product of its (nonzero) digits is 7840, while the sum is 32.

The spelling of 21700005278 in words is "twenty-one billion, seven hundred million, five thousand, two hundred seventy-eight".