21122907 has 8 divisors (see below), whose sum is σ = 30330384. Its totient is φ = 12998688.

The previous prime is 21122887. The next prime is 21122909. The reversal of 21122907 is 70922112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21122907 - 2¹⁰ = 21121883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21122909) 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 in 7 ways as a sum of consecutive naturals, for example, 270768 + ... + 270845.

It is an arithmetic number, because the mean of its divisors is an integer number (3791298).

Almost surely, 2^21122907 is an apocalyptic number.

21122907 is a deficient number, since it is larger than the sum of its proper divisors (9207477).

21122907 is a wasteful number, since it uses less digits than its factorization.

21122907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541629.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21122907 is about 4595.9663836891. The cubic root of 21122907 is about 276.4296108158.

The spelling of 21122907 in words is "twenty-one million, one hundred twenty-two thousand, nine hundred seven".