21496507 has 2 divisors, whose sum is σ = 21496508. Its totient is φ = 21496506.

The previous prime is 21496499. The next prime is 21496523. The reversal of 21496507 is 70569412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21496507 - 2³ = 21496499 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (21497507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748253 + 10748254.

It is an arithmetic number, because the mean of its divisors is an integer number (10748254).

Almost surely, 2^21496507 is an apocalyptic number.

21496507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21496507 is an equidigital number, since it uses as much as digits as its factorization.

21496507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21496507 is about 4636.4325725713. The cubic root of 21496507 is about 278.0498288957.

It can be divided in two parts, 214 and 96507, that added together give a square (96721 = 311²).

The spelling of 21496507 in words is "twenty-one million, four hundred ninety-six thousand, five hundred seven".