21372107343 has 4 divisors (see below), whose sum is σ = 28496143128. Its totient is φ = 14248071560.

The previous prime is 21372107333. The next prime is 21372107363. The reversal of 21372107343 is 34370127312.

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 21372107343 - 2⁶ = 21372107279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372107303) 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, 3562017888 + ... + 3562017893.

It is an arithmetic number, because the mean of its divisors is an integer number (7124035782).

Almost surely, 2^21372107343 is an apocalyptic number.

21372107343 is a deficient number, since it is larger than the sum of its proper divisors (7124035785).

21372107343 is an equidigital number, since it uses as much as digits as its factorization.

21372107343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7124035784.

The product of its (nonzero) digits is 21168, while the sum is 33.

The spelling of 21372107343 in words is "twenty-one billion, three hundred seventy-two million, one hundred seven thousand, three hundred forty-three".