21625293 has 8 divisors (see below), whose sum is σ = 29306656. Its totient is φ = 14180400.

The previous prime is 21625243. The next prime is 21625297. The reversal of 21625293 is 39252612.

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

It is not a de Polignac number, because 21625293 - 2⁶ = 21625229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21625293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58903 + ... + 59268.

It is an arithmetic number, because the mean of its divisors is an integer number (3663332).

Almost surely, 2^21625293 is an apocalyptic number.

It is an amenable number.

21625293 is a deficient number, since it is larger than the sum of its proper divisors (7681363).

21625293 is a wasteful number, since it uses less digits than its factorization.

21625293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118235.

The product of its digits is 6480, while the sum is 30.

The square root of 21625293 is about 4650.3003128830. The cubic root of 21625293 is about 278.6039910466.

The spelling of 21625293 in words is "twenty-one million, six hundred twenty-five thousand, two hundred ninety-three".