21941960 has 32 divisors (see below), whose sum is σ = 51969600. Its totient is φ = 8314560.

The previous prime is 21941921. The next prime is 21941981. The reversal of 21941960 is 6914912.

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 in 7 ways as a sum of consecutive naturals, for example, 13676 + ... + 15195.

It is an arithmetic number, because the mean of its divisors is an integer number (1624050).

Almost surely, 2^21941960 is an apocalyptic number.

21941960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21941960 is an abundant number, since it is smaller than the sum of its proper divisors (30027640).

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

21941960 is a wasteful number, since it uses less digits than its factorization.

21941960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28901 (or 28897 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21941960 is about 4684.2245889795. The cubic root of 21941960 is about 279.9573064157.

The spelling of 21941960 in words is "twenty-one million, nine hundred forty-one thousand, nine hundred sixty".