21422955 has 8 divisors (see below), whose sum is σ = 34276752. Its totient is φ = 11425568.

The previous prime is 21422939. The next prime is 21422993. The reversal of 21422955 is 55922412.

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 21422955 - 2⁴ = 21422939 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714084 + ... + 714113.

It is an arithmetic number, because the mean of its divisors is an integer number (4284594).

Almost surely, 2^21422955 is an apocalyptic number.

21422955 is a deficient number, since it is larger than the sum of its proper divisors (12853797).

21422955 is a wasteful number, since it uses less digits than its factorization.

21422955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428205.

The product of its digits is 7200, while the sum is 30.

The square root of 21422955 is about 4628.4938154868. The cubic root of 21422955 is about 277.7323433542.

The spelling of 21422955 in words is "twenty-one million, four hundred twenty-two thousand, nine hundred fifty-five".