21761325 has 48 divisors (see below), whose sum is σ = 40493440. Its totient is φ = 11456640.

The previous prime is 21761303. The next prime is 21761347. The reversal of 21761325 is 52316712.

It is a happy number.

21761325 is a `hidden beast` number, since 21 + 7 + 613 + 25 = 666.

It is an interprime number because it is at equal distance from previous prime (21761303) and next prime (21761347).

It is not a de Polignac number, because 21761325 - 2¹⁴ = 21744941 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69369 + ... + 69681.

Almost surely, 2^21761325 is an apocalyptic number.

21761325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21761325 is a deficient number, since it is larger than the sum of its proper divisors (18732115).

21761325 is a wasteful number, since it uses less digits than its factorization.

21761325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 424 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21761325 is about 4664.9035359801. The cubic root of 21761325 is about 279.1869483545.

The spelling of 21761325 in words is "twenty-one million, seven hundred sixty-one thousand, three hundred twenty-five".