21955914 has 16 divisors (see below), whose sum is σ = 48791040. Its totient is φ = 7318620.

The previous prime is 21955889. The next prime is 21955919. The reversal of 21955914 is 41955912.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21955919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203242 + ... + 203349.

It is an arithmetic number, because the mean of its divisors is an integer number (3049440).

Almost surely, 2^21955914 is an apocalyptic number.

21955914 is an abundant number, since it is smaller than the sum of its proper divisors (26835126).

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

21955914 is a wasteful number, since it uses less digits than its factorization.

21955914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406602 (or 406596 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 21955914 is about 4685.7138196864. The cubic root of 21955914 is about 280.0166401675.

The spelling of 21955914 in words is "twenty-one million, nine hundred fifty-five thousand, nine hundred fourteen".