21425695 has 16 divisors (see below), whose sum is σ = 27332640. Its totient is φ = 16067584.

The previous prime is 21425689. The next prime is 21425699. The reversal of 21425695 is 59652412.

It is a happy number.

It is not a de Polignac number, because 21425695 - 2³ = 21425687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21425695.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37371 + ... + 37939.

It is an arithmetic number, because the mean of its divisors is an integer number (1708290).

Almost surely, 2^21425695 is an apocalyptic number.

21425695 is a deficient number, since it is larger than the sum of its proper divisors (5906945).

21425695 is a wasteful number, since it uses less digits than its factorization.

21425695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034.

The product of its digits is 21600, while the sum is 34.

The square root of 21425695 is about 4628.7897986407. The cubic root of 21425695 is about 277.7441835225.

The spelling of 21425695 in words is "twenty-one million, four hundred twenty-five thousand, six hundred ninety-five".