21975122 has 8 divisors (see below), whose sum is σ = 35498316. Its totient is φ = 10142352.

The previous prime is 21975113. The next prime is 21975131. The reversal of 21975122 is 22157912.

It is an interprime number because it is at equal distance from previous prime (21975113) and next prime (21975131).

It can be written as a sum of positive squares in 2 ways, for example, as 21799561 + 175561 = 4669^2 + 419^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422573 + ... + 422624.

Almost surely, 2^21975122 is an apocalyptic number.

21975122 is a deficient number, since it is larger than the sum of its proper divisors (13523194).

21975122 is a wasteful number, since it uses less digits than its factorization.

21975122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845212.

The product of its digits is 2520, while the sum is 29.

The square root of 21975122 is about 4687.7630059550. The cubic root of 21975122 is about 280.0982733275.

The spelling of 21975122 in words is "twenty-one million, nine hundred seventy-five thousand, one hundred twenty-two".