21975454 has 4 divisors (see below), whose sum is σ = 32963184. Its totient is φ = 10987726.

The previous prime is 21975427. The next prime is 21975463. The reversal of 21975454 is 45457912.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21975454² = 965841157012232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5493862 + ... + 5493865.

It is an arithmetic number, because the mean of its divisors is an integer number (8240796).

Almost surely, 2^21975454 is an apocalyptic number.

21975454 is a deficient number, since it is larger than the sum of its proper divisors (10987730).

21975454 is a wasteful number, since it uses less digits than its factorization.

21975454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10987729.

The product of its digits is 50400, while the sum is 37.

The square root of 21975454 is about 4687.7984171677. The cubic root of 21975454 is about 280.0996838947.

The spelling of 21975454 in words is "twenty-one million, nine hundred seventy-five thousand, four hundred fifty-four".