21360971 has 2 divisors, whose sum is σ = 21360972. Its totient is φ = 21360970.

The previous prime is 21360967. The next prime is 21361001. The reversal of 21360971 is 17906312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21360971 - 2² = 21360967 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21360931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10680485 + 10680486.

It is an arithmetic number, because the mean of its divisors is an integer number (10680486).

Almost surely, 2^21360971 is an apocalyptic number.

21360971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21360971 is an equidigital number, since it uses as much as digits as its factorization.

21360971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21360971 is about 4621.7930503215. The cubic root of 21360971 is about 277.4642261056.

The spelling of 21360971 in words is "twenty-one million, three hundred sixty thousand, nine hundred seventy-one".