21419955 has 24 divisors (see below), whose sum is σ = 37257792. Its totient is φ = 11384064.

The previous prime is 21419939. The next prime is 21420001. The reversal of 21419955 is 55991412.

It is not a de Polignac number, because 21419955 - 2⁴ = 21419939 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15867 + ... + 17163.

It is an arithmetic number, because the mean of its divisors is an integer number (1552408).

Almost surely, 2^21419955 is an apocalyptic number.

21419955 is a deficient number, since it is larger than the sum of its proper divisors (15837837).

21419955 is a wasteful number, since it uses less digits than its factorization.

21419955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675 (or 1672 counting only the distinct ones).

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

The square root of 21419955 is about 4628.1697246320. The cubic root of 21419955 is about 277.7193785083.

The spelling of 21419955 in words is "twenty-one million, four hundred nineteen thousand, nine hundred fifty-five".