21954212 has 24 divisors (see below), whose sum is σ = 44009280. Its totient is φ = 9387360.

The previous prime is 21954211. The next prime is 21954227. The reversal of 21954212 is 21245912.

It is not an unprimeable number, because it can be changed into a prime (21954211) 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, 20162 + ... + 21222.

It is an arithmetic number, because the mean of its divisors is an integer number (1833720).

Almost surely, 2^21954212 is an apocalyptic number.

It is an amenable number.

21954212 is an abundant number, since it is smaller than the sum of its proper divisors (22055068).

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

21954212 is a wasteful number, since it uses less digits than its factorization.

21954212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1809 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 21954212 is about 4685.5322002949. The cubic root of 21954212 is about 280.0094044460.

The spelling of 21954212 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred twelve".