21955373 has 8 divisors (see below), whose sum is σ = 24039936. Its totient is φ = 19885600.

The previous prime is 21955343. The next prime is 21955399. The reversal of 21955373 is 37355912.

It is a happy number.

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 21955373 - 2⁶ = 21955309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21955333) 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, 461 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (3004992).

Almost surely, 2^21955373 is an apocalyptic number.

It is an amenable number.

21955373 is a deficient number, since it is larger than the sum of its proper divisors (2084563).

21955373 is a wasteful number, since it uses less digits than its factorization.

21955373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7395.

The product of its digits is 28350, while the sum is 35.

The square root of 21955373 is about 4685.6560906665. The cubic root of 21955373 is about 280.0143402519.

The spelling of 21955373 in words is "twenty-one million, nine hundred fifty-five thousand, three hundred seventy-three".