21714851 has 2 divisors, whose sum is σ = 21714852. Its totient is φ = 21714850.

The previous prime is 21714839. The next prime is 21714859. The reversal of 21714851 is 15841712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21714851 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21714859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10857425 + 10857426.

It is an arithmetic number, because the mean of its divisors is an integer number (10857426).

Almost surely, 2^21714851 is an apocalyptic number.

21714851 is a deficient number, since it is larger than the sum of its proper divisors (1).

21714851 is an equidigital number, since it uses as much as digits as its factorization.

21714851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 29.

The square root of 21714851 is about 4659.9196345001. The cubic root of 21714851 is about 278.9880606222.

The spelling of 21714851 in words is "twenty-one million, seven hundred fourteen thousand, eight hundred fifty-one".