21293376407 has 4 divisors (see below), whose sum is σ = 21695138280. Its totient is φ = 20891614536.

The previous prime is 21293376337. The next prime is 21293376413. The reversal of 21293376407 is 70467339212.

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 21293376407 - 2²⁰ = 21292327831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21293376487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200880857 + ... + 200880962.

It is an arithmetic number, because the mean of its divisors is an integer number (5423784570).

Almost surely, 2^21293376407 is an apocalyptic number.

21293376407 is a deficient number, since it is larger than the sum of its proper divisors (401761873).

21293376407 is an equidigital number, since it uses as much as digits as its factorization.

21293376407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401761872.

The product of its (nonzero) digits is 381024, while the sum is 44.

The spelling of 21293376407 in words is "twenty-one billion, two hundred ninety-three million, three hundred seventy-six thousand, four hundred seven".