21946330 has 64 divisors (see below), whose sum is σ = 49248000. Its totient is φ = 6870528.

The previous prime is 21946271. The next prime is 21946333. The reversal of 21946330 is 3364912.

It is not an unprimeable number, because it can be changed into a prime (21946333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38286 + ... + 38854.

It is an arithmetic number, because the mean of its divisors is an integer number (769500).

Almost surely, 2^21946330 is an apocalyptic number.

21946330 is an abundant number, since it is smaller than the sum of its proper divisors (27301670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21946330 is a wasteful number, since it uses less digits than its factorization.

21946330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 21946330 is about 4684.6910250304. The cubic root of 21946330 is about 279.9758907813.

The spelling of 21946330 in words is "twenty-one million, nine hundred forty-six thousand, three hundred thirty".