21370927 has 2 divisors, whose sum is σ = 21370928. Its totient is φ = 21370926.

The previous prime is 21370913. The next prime is 21370981. The reversal of 21370927 is 72907312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21370927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21370627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10685463 + 10685464.

It is an arithmetic number, because the mean of its divisors is an integer number (10685464).

Almost surely, 2^21370927 is an apocalyptic number.

21370927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21370927 is an equidigital number, since it uses as much as digits as its factorization.

21370927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21370927 is about 4622.8699960090. The cubic root of 21370927 is about 277.5073265928.

The spelling of 21370927 in words is "twenty-one million, three hundred seventy thousand, nine hundred twenty-seven".