21911442 has 32 divisors (see below), whose sum is σ = 50246784. Its totient is φ = 6240000.

The previous prime is 21911441. The next prime is 21911509. The reversal of 21911442 is 24411912.

It is a super-2 number, since 2×21911442² = 960222581038728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21911441) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16192 + ... + 17492.

It is an arithmetic number, because the mean of its divisors is an integer number (1570212).

Almost surely, 2^21911442 is an apocalyptic number.

21911442 is an abundant number, since it is smaller than the sum of its proper divisors (28335342).

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

21911442 is a wasteful number, since it uses less digits than its factorization.

21911442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714.

The product of its digits is 576, while the sum is 24.

The square root of 21911442 is about 4680.9659259602. The cubic root of 21911442 is about 279.8274532157.

The spelling of 21911442 in words is "twenty-one million, nine hundred eleven thousand, four hundred forty-two".