21259125 has 32 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 11336400.

The previous prime is 21259123. The next prime is 21259141. The reversal of 21259125 is 52195212.

It is not a de Polignac number, because 21259125 - 2¹ = 21259123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21259123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^21259125 is an apocalyptic number.

21259125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21259125 is a deficient number, since it is larger than the sum of its proper divisors (18052875).

21259125 is an equidigital number, since it uses as much as digits as its factorization.

21259125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323 (or 6307 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 21259125 is about 4610.7618676310. The cubic root of 21259125 is about 277.0225537380.

The spelling of 21259125 in words is "twenty-one million, two hundred fifty-nine thousand, one hundred twenty-five".