21954672 has 40 divisors (see below), whose sum is σ = 63019280. Its totient is φ = 7318080.

The previous prime is 21954643. The next prime is 21954679. The reversal of 21954672 is 27645912.

21954672 is a `hidden beast` number, since 2 + 195 + 467 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24979 + ... + 25842.

It is an arithmetic number, because the mean of its divisors is an integer number (1575482).

Almost surely, 2^21954672 is an apocalyptic number.

It is an amenable number.

21954672 is an abundant number, since it is smaller than the sum of its proper divisors (41064608).

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

21954672 is a wasteful number, since it uses less digits than its factorization.

21954672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50838 (or 50826 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21954672 is about 4685.5812873111. The cubic root of 21954672 is about 280.0113600833.

It can be divided in two parts, 2195467 and 2, that multiplied together give a palindrome (4390934).

The spelling of 21954672 in words is "twenty-one million, nine hundred fifty-four thousand, six hundred seventy-two".