21374963 has 4 divisors (see below), whose sum is σ = 21385008. Its totient is φ = 21364920.

The previous prime is 21374959. The next prime is 21374971. The reversal of 21374963 is 36947312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21374963 - 2² = 21374959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21371963) 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, 431 + ... + 6552.

It is an arithmetic number, because the mean of its divisors is an integer number (5346252).

Almost surely, 2^21374963 is an apocalyptic number.

21374963 is a deficient number, since it is larger than the sum of its proper divisors (10045).

21374963 is an equidigital number, since it uses as much as digits as its factorization.

21374963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10044.

The product of its digits is 27216, while the sum is 35.

The square root of 21374963 is about 4623.3065007633. The cubic root of 21374963 is about 277.5247950141.

The spelling of 21374963 in words is "twenty-one million, three hundred seventy-four thousand, nine hundred sixty-three".