21323963 has 2 divisors, whose sum is σ = 21323964. Its totient is φ = 21323962.

The previous prime is 21323959. The next prime is 21323971. The reversal of 21323963 is 36932312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21323963 - 2² = 21323959 is a prime.

It is a super-2 number, since 2×21323963² = 909422796050738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21323983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661981 + 10661982.

It is an arithmetic number, because the mean of its divisors is an integer number (10661982).

Almost surely, 2^21323963 is an apocalyptic number.

21323963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323963 is an equidigital number, since it uses as much as digits as its factorization.

21323963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 29.

The square root of 21323963 is about 4617.7876737676. The cubic root of 21323963 is about 277.3038973794.

The spelling of 21323963 in words is "twenty-one million, three hundred twenty-three thousand, nine hundred sixty-three".