21911740 has 24 divisors (see below), whose sum is σ = 46165392. Its totient is φ = 8736000.

The previous prime is 21911713. The next prime is 21911741. The reversal of 21911740 is 4711912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21911741) 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 7 ways as a sum of consecutive naturals, for example, 5115 + ... + 8365.

It is an arithmetic number, because the mean of its divisors is an integer number (1923558).

Almost surely, 2^21911740 is an apocalyptic number.

21911740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21911740 is an abundant number, since it is smaller than the sum of its proper divisors (24253652).

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

21911740 is a wasteful number, since it uses less digits than its factorization.

21911740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597 (or 3595 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21911740 is about 4680.9977568890. The cubic root of 21911740 is about 279.8287217797.

The spelling of 21911740 in words is "twenty-one million, nine hundred eleven thousand, seven hundred forty".