21925454 has 4 divisors (see below), whose sum is σ = 32888184. Its totient is φ = 10962726.

The previous prime is 21925433. The next prime is 21925471. The reversal of 21925454 is 45452912.

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

It is a super-2 number, since 2×21925454² = 961451066212232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21925454.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5481362 + ... + 5481365.

It is an arithmetic number, because the mean of its divisors is an integer number (8222046).

Almost surely, 2^21925454 is an apocalyptic number.

21925454 is a deficient number, since it is larger than the sum of its proper divisors (10962730).

21925454 is a wasteful number, since it uses less digits than its factorization.

21925454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10962729.

The product of its digits is 14400, while the sum is 32.

The square root of 21925454 is about 4682.4623863946. The cubic root of 21925454 is about 279.8870888280.

The spelling of 21925454 in words is "twenty-one million, nine hundred twenty-five thousand, four hundred fifty-four".