21274347707 has 4 divisors (see below), whose sum is σ = 21275517336. Its totient is φ = 21273178080.

The previous prime is 21274347641. The next prime is 21274347779. The reversal of 21274347707 is 70774347212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21274347707 - 2²² = 21270153403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21274340707) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 557093 + ... + 594054.

It is an arithmetic number, because the mean of its divisors is an integer number (5318879334).

Almost surely, 2^21274347707 is an apocalyptic number.

21274347707 is a deficient number, since it is larger than the sum of its proper divisors (1169629).

21274347707 is a wasteful number, since it uses less digits than its factorization.

21274347707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169628.

The product of its (nonzero) digits is 460992, while the sum is 44.

The spelling of 21274347707 in words is "twenty-one billion, two hundred seventy-four million, three hundred forty-seven thousand, seven hundred seven".