21368707 has 2 divisors, whose sum is σ = 21368708. Its totient is φ = 21368706.

The previous prime is 21368651. The next prime is 21368713. The reversal of 21368707 is 70786312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21368707 is a prime.

It is not a weakly prime, because it can be changed into another prime (21368777) 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, 10684353 + 10684354.

It is an arithmetic number, because the mean of its divisors is an integer number (10684354).

Almost surely, 2^21368707 is an apocalyptic number.

21368707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21368707 is an equidigital number, since it uses as much as digits as its factorization.

21368707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 21368707 is about 4622.6298791921. The cubic root of 21368707 is about 277.4977171579.

The spelling of 21368707 in words is "twenty-one million, three hundred sixty-eight thousand, seven hundred seven".