21910146 has 16 divisors (see below), whose sum is σ = 43981824. Its totient is φ = 7276464.

The previous prime is 21910123. The next prime is 21910157. The reversal of 21910146 is 64101912.

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, 4930 + ... + 8253.

It is an arithmetic number, because the mean of its divisors is an integer number (2748864).

Almost surely, 2^21910146 is an apocalyptic number.

21910146 is an abundant number, since it is smaller than the sum of its proper divisors (22071678).

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

21910146 is a wasteful number, since it uses less digits than its factorization.

21910146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13465.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21910146 is about 4680.8274909464. The cubic root of 21910146 is about 279.8219361053.

The spelling of 21910146 in words is "twenty-one million, nine hundred ten thousand, one hundred forty-six".