21373463 has 4 divisors (see below), whose sum is σ = 22302768. Its totient is φ = 20444160.

The previous prime is 21373447. The next prime is 21373487. The reversal of 21373463 is 36437312.

It is a happy number.

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 21373463 - 2⁴ = 21373447 is a prime.

It is a super-2 number, since 2×21373463² = 913649841224738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21370463) 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, 464618 + ... + 464663.

It is an arithmetic number, because the mean of its divisors is an integer number (5575692).

Almost surely, 2^21373463 is an apocalyptic number.

21373463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21373463 is a deficient number, since it is larger than the sum of its proper divisors (929305).

21373463 is an equidigital number, since it uses as much as digits as its factorization.

21373463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929304.

The product of its digits is 9072, while the sum is 29.

The square root of 21373463 is about 4623.1442763556. The cubic root of 21373463 is about 277.5183030430.

The spelling of 21373463 in words is "twenty-one million, three hundred seventy-three thousand, four hundred sixty-three".