21923125 has 20 divisors (see below), whose sum is σ = 31314976. Its totient is φ = 15030000.

The previous prime is 21923119. The next prime is 21923147. The reversal of 21923125 is 52132912.

It is a happy number.

It is not a de Polignac number, because 21923125 - 2¹³ = 21914933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 21923125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1870 + ... + 6880.

Almost surely, 2^21923125 is an apocalyptic number.

21923125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21923125 is a deficient number, since it is larger than the sum of its proper divisors (9391851).

21923125 is an frugal number, since it uses more digits than its factorization.

21923125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038 (or 5023 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 21923125 is about 4682.2136858542. The cubic root of 21923125 is about 279.8771782751.

The spelling of 21923125 in words is "twenty-one million, nine hundred twenty-three thousand, one hundred twenty-five".