21925039 has 4 divisors (see below), whose sum is σ = 22225456. Its totient is φ = 21624624.

The previous prime is 21925021. The next prime is 21925097. The reversal of 21925039 is 93052912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21925039 - 2¹³ = 21916847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21925039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21925009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150099 + ... + 150244.

It is an arithmetic number, because the mean of its divisors is an integer number (5556364).

Almost surely, 2^21925039 is an apocalyptic number.

21925039 is a deficient number, since it is larger than the sum of its proper divisors (300417).

21925039 is an equidigital number, since it uses as much as digits as its factorization.

21925039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300416.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 21925039 is about 4682.4180718941. The cubic root of 21925039 is about 279.8853229371.

The spelling of 21925039 in words is "twenty-one million, nine hundred twenty-five thousand, thirty-nine".