21914907 has 24 divisors (see below), whose sum is σ = 34790976. Its totient is φ = 12228048.

The previous prime is 21914903. The next prime is 21914927. The reversal of 21914907 is 70941912.

It is not a de Polignac number, because 21914907 - 2² = 21914903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21914903) 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 23 ways as a sum of consecutive naturals, for example, 4588 + ... + 8054.

It is an arithmetic number, because the mean of its divisors is an integer number (1449624).

Almost surely, 2^21914907 is an apocalyptic number.

21914907 is a deficient number, since it is larger than the sum of its proper divisors (12876069).

21914907 is a wasteful number, since it uses less digits than its factorization.

21914907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3527 (or 3520 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 21914907 is about 4681.3360272469. The cubic root of 21914907 is about 279.8422027549.

The spelling of 21914907 in words is "twenty-one million, nine hundred fourteen thousand, nine hundred seven".