21274507 has 2 divisors, whose sum is σ = 21274508. Its totient is φ = 21274506.

The previous prime is 21274499. The next prime is 21274529. The reversal of 21274507 is 70547212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21274507 - 2³ = 21274499 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 (21274537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637253 + 10637254.

It is an arithmetic number, because the mean of its divisors is an integer number (10637254).

Almost surely, 2^21274507 is an apocalyptic number.

21274507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274507 is an equidigital number, since it uses as much as digits as its factorization.

21274507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 21274507 is about 4612.4296200593. The cubic root of 21274507 is about 277.0893506799.

The spelling of 21274507 in words is "twenty-one million, two hundred seventy-four thousand, five hundred seven".