21957450 has 24 divisors (see below), whose sum is σ = 54454848. Its totient is φ = 5855280.

The previous prime is 21957431. The next prime is 21957473. The reversal of 21957450 is 5475912.

It is a super-2 number, since 2×21957450² = 964259221005000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73042 + ... + 73341.

It is an arithmetic number, because the mean of its divisors is an integer number (2268952).

Almost surely, 2^21957450 is an apocalyptic number.

21957450 is an abundant number, since it is smaller than the sum of its proper divisors (32497398).

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

21957450 is a wasteful number, since it uses less digits than its factorization.

21957450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146398 (or 146393 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 21957450 is about 4685.8777192752. The cubic root of 21957450 is about 280.0231698514.

The spelling of 21957450 in words is "twenty-one million, nine hundred fifty-seven thousand, four hundred fifty".