21425707 has 2 divisors, whose sum is σ = 21425708. Its totient is φ = 21425706.

The previous prime is 21425699. The next prime is 21425759. The reversal of 21425707 is 70752412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21425707 - 2³ = 21425699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21425777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712853 + 10712854.

It is an arithmetic number, because the mean of its divisors is an integer number (10712854).

Almost surely, 2^21425707 is an apocalyptic number.

21425707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425707 is an equidigital number, since it uses as much as digits as its factorization.

21425707 is an evil number, because the sum of its binary digits is even.

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

The square root of 21425707 is about 4628.7910948756. The cubic root of 21425707 is about 277.7442353750.

It can be divided in two parts, 214 and 25707, that added together give a square (25921 = 161²).

The spelling of 21425707 in words is "twenty-one million, four hundred twenty-five thousand, seven hundred seven".