21425954 has 48 divisors (see below), whose sum is σ = 37920960. Its totient is φ = 9055200.

The previous prime is 21425893. The next prime is 21425993. The reversal of 21425954 is 45952412.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21425954.

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 in 23 ways as a sum of consecutive naturals, for example, 301739 + ... + 301809.

It is an arithmetic number, because the mean of its divisors is an integer number (790020).

Almost surely, 2^21425954 is an apocalyptic number.

21425954 is a deficient number, since it is larger than the sum of its proper divisors (16495006).

21425954 is a wasteful number, since it uses less digits than its factorization.

21425954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 156 counting only the distinct ones).

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

The square root of 21425954 is about 4628.8177756313. The cubic root of 21425954 is about 277.7453026687.

The spelling of 21425954 in words is "twenty-one million, four hundred twenty-five thousand, nine hundred fifty-four".