21952419 has 16 divisors (see below), whose sum is σ = 30979584. Its totient is φ = 13798400.

The previous prime is 21952387. The next prime is 21952459. The reversal of 21952419 is 91425912.

It is a cyclic number.

It is not a de Polignac number, because 21952419 - 2⁵ = 21952387 is a prime.

It is a super-2 number, since 2×21952419² = 963817399903122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21952419.

It is not an unprimeable number, because it can be changed into a prime (21952459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2659 + ... + 7139.

It is an arithmetic number, because the mean of its divisors is an integer number (1936224).

Almost surely, 2^21952419 is an apocalyptic number.

21952419 is a deficient number, since it is larger than the sum of its proper divisors (9027165).

21952419 is a wasteful number, since it uses less digits than its factorization.

21952419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578.

The product of its digits is 6480, while the sum is 33.

The square root of 21952419 is about 4685.3408627335. The cubic root of 21952419 is about 280.0017814513.

The spelling of 21952419 in words is "twenty-one million, nine hundred fifty-two thousand, four hundred nineteen".