21963375 has 48 divisors (see below), whose sum is σ = 45264960. Its totient is φ = 10036800.

The previous prime is 21963341. The next prime is 21963379. The reversal of 21963375 is 57336912.

21963375 is a `hidden beast` number, since 2 + 19 + 633 + 7 + 5 = 666.

It is not a de Polignac number, because 21963375 - 2⁷ = 21963247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21963379) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6481 + ... + 9269.

It is an arithmetic number, because the mean of its divisors is an integer number (943020).

Almost surely, 2^21963375 is an apocalyptic number.

21963375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21963375 is an abundant number, since it is smaller than the sum of its proper divisors (23301585).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21963375 is a wasteful number, since it uses less digits than its factorization.

21963375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817 (or 2804 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21963375 is about 4686.5098954339. The cubic root of 21963375 is about 280.0483547441.

The spelling of 21963375 in words is "twenty-one million, nine hundred sixty-three thousand, three hundred seventy-five".