21414857 has 2 divisors, whose sum is σ = 21414858. Its totient is φ = 21414856.

The previous prime is 21414853. The next prime is 21414871. The reversal of 21414857 is 75841412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 657721 = 4556^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 21414857 - 2² = 21414853 is a prime.

It is a super-2 number, since 2×21414857² = 917192200660898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21414853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707428 + 10707429.

It is an arithmetic number, because the mean of its divisors is an integer number (10707429).

Almost surely, 2^21414857 is an apocalyptic number.

It is an amenable number.

21414857 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414857 is an equidigital number, since it uses as much as digits as its factorization.

21414857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 32.

The square root of 21414857 is about 4627.6189341820. The cubic root of 21414857 is about 277.6973441370.

The spelling of 21414857 in words is "twenty-one million, four hundred fourteen thousand, eight hundred fifty-seven".