21136125 has 32 divisors (see below), whose sum is σ = 35493120. Its totient is φ = 11169600.

The previous prime is 21136123. The next prime is 21136127. The reversal of 21136125 is 52163112.

It is an interprime number because it is at equal distance from previous prime (21136123) and next prime (21136127).

It is not a de Polignac number, because 21136125 - 2¹ = 21136123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136123) 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, 58696 + ... + 59054.

It is an arithmetic number, because the mean of its divisors is an integer number (1109160).

Almost surely, 2^21136125 is an apocalyptic number.

21136125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21136125 is a deficient number, since it is larger than the sum of its proper divisors (14356995).

21136125 is a wasteful number, since it uses less digits than its factorization.

21136125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 524 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 21136125 is about 4597.4041588705. The cubic root of 21136125 is about 276.4872588897.

Adding to 21136125 its reverse (52163112), we get a palindrome (73299237).

The spelling of 21136125 in words is "twenty-one million, one hundred thirty-six thousand, one hundred twenty-five".