21919560 has 64 divisors (see below), whose sum is σ = 70822080. Its totient is φ = 5395200.

The previous prime is 21919549. The next prime is 21919567. The reversal of 21919560 is 6591912.

It is a super-2 number, since 2×21919560² = 960934221187200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21919567) 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, 5466 + ... + 8585.

It is an arithmetic number, because the mean of its divisors is an integer number (1106595).

Almost surely, 2^21919560 is an apocalyptic number.

21919560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21919560 is an abundant number, since it is smaller than the sum of its proper divisors (48902520).

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

21919560 is a wasteful number, since it uses less digits than its factorization.

21919560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14078 (or 14074 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 21919560 is about 4681.8329743809. The cubic root of 21919560 is about 279.8620068336.

The spelling of 21919560 in words is "twenty-one million, nine hundred nineteen thousand, five hundred sixty".