21873955 has 8 divisors (see below), whose sum is σ = 26694000. Its totient is φ = 17202336.

The previous prime is 21873953. The next prime is 21873967. The reversal of 21873955 is 55937812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21873955 - 2¹ = 21873953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21873953) 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, 36780 + ... + 37369.

It is an arithmetic number, because the mean of its divisors is an integer number (3336750).

Almost surely, 2^21873955 is an apocalyptic number.

21873955 is a deficient number, since it is larger than the sum of its proper divisors (4820045).

21873955 is an equidigital number, since it uses as much as digits as its factorization.

21873955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74213.

The product of its digits is 75600, while the sum is 40.

The square root of 21873955 is about 4676.9600169341. The cubic root of 21873955 is about 279.6677820020.

The spelling of 21873955 in words is "twenty-one million, eight hundred seventy-three thousand, nine hundred fifty-five".