21954512 has 20 divisors (see below), whose sum is σ = 44387040. Its totient is φ = 10499808.

The previous prime is 21954511. The next prime is 21954533. The reversal of 21954512 is 21545912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29462 + ... + 30197.

It is an arithmetic number, because the mean of its divisors is an integer number (2219352).

Almost surely, 2^21954512 is an apocalyptic number.

It is an amenable number.

21954512 is an abundant number, since it is smaller than the sum of its proper divisors (22432528).

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

21954512 is a wasteful number, since it uses less digits than its factorization.

21954512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59690 (or 59684 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 21954512 is about 4685.5642136247. The cubic root of 21954512 is about 280.0106798647.

The spelling of 21954512 in words is "twenty-one million, nine hundred fifty-four thousand, five hundred twelve".