21126325 has 24 divisors (see below), whose sum is σ = 30265920. Its totient is φ = 14457600.

The previous prime is 21126317. The next prime is 21126337. The reversal of 21126325 is 52362112.

It is not a de Polignac number, because 21126325 - 2³ = 21126317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21126296 and 21126305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2416 + ... + 6934.

It is an arithmetic number, because the mean of its divisors is an integer number (1261080).

Almost surely, 2^21126325 is an apocalyptic number.

21126325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21126325 is a deficient number, since it is larger than the sum of its proper divisors (9139595).

21126325 is a wasteful number, since it uses less digits than its factorization.

21126325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4557 (or 4552 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 21126325 is about 4596.3382164501. The cubic root of 21126325 is about 276.4445201502. Note that the first 3 decimals are identical.

Adding to 21126325 its reverse (52362112), we get a palindrome (73488437).

The spelling of 21126325 in words is "twenty-one million, one hundred twenty-six thousand, three hundred twenty-five".