21459707 has 2 divisors, whose sum is σ = 21459708. Its totient is φ = 21459706.

The previous prime is 21459703. The next prime is 21459727. The reversal of 21459707 is 70795412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21459707 - 2² = 21459703 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21459701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10729853 + 10729854.

It is an arithmetic number, because the mean of its divisors is an integer number (10729854).

Almost surely, 2^21459707 is an apocalyptic number.

21459707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21459707 is an equidigital number, since it uses as much as digits as its factorization.

21459707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 21459707 is about 4632.4623042179. The cubic root of 21459707 is about 277.8910732098.

The spelling of 21459707 in words is "twenty-one million, four hundred fifty-nine thousand, seven hundred seven".