21954272 has 24 divisors (see below), whose sum is σ = 45498600. Its totient is φ = 10399104.

The previous prime is 21954263. The next prime is 21954281. The reversal of 21954272 is 27245912.

It is an interprime number because it is at equal distance from previous prime (21954263) and next prime (21954281).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17447 + ... + 18662.

It is an arithmetic number, because the mean of its divisors is an integer number (1895775).

Almost surely, 2^21954272 is an apocalyptic number.

It is an amenable number.

21954272 is an abundant number, since it is smaller than the sum of its proper divisors (23544328).

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

21954272 is a wasteful number, since it uses less digits than its factorization.

21954272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36138 (or 36130 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 21954272 is about 4685.5386029783. The cubic root of 21954272 is about 280.0096595307.

The spelling of 21954272 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred seventy-two".