21322958 has 4 divisors (see below), whose sum is σ = 31984440. Its totient is φ = 10661478.

The previous prime is 21322937. The next prime is 21322963. The reversal of 21322958 is 85922312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330738 + ... + 5330741.

It is an arithmetic number, because the mean of its divisors is an integer number (7996110).

Almost surely, 2^21322958 is an apocalyptic number.

21322958 is a deficient number, since it is larger than the sum of its proper divisors (10661482).

21322958 is a wasteful number, since it uses less digits than its factorization.

21322958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661481.

The product of its digits is 8640, while the sum is 32.

The square root of 21322958 is about 4617.6788541431. The cubic root of 21322958 is about 277.2995408597.

The spelling of 21322958 in words is "twenty-one million, three hundred twenty-two thousand, nine hundred fifty-eight".