21426907 has 2 divisors, whose sum is σ = 21426908. Its totient is φ = 21426906.

The previous prime is 21426901. The next prime is 21426929. The reversal of 21426907 is 70962412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21426907 is a prime.

It is a super-2 number, since 2×21426907² = 918224687173298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21426901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10713453 + 10713454.

It is an arithmetic number, because the mean of its divisors is an integer number (10713454).

Almost surely, 2^21426907 is an apocalyptic number.

21426907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21426907 is an equidigital number, since it uses as much as digits as its factorization.

21426907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21426907 is about 4628.9207165386. The cubic root of 21426907 is about 277.7494205304.

The spelling of 21426907 in words is "twenty-one million, four hundred twenty-six thousand, nine hundred seven".