21194880 has 256 divisors, whose sum is σ = 82252800. Its totient is φ = 4534272.

The previous prime is 21194879. The next prime is 21194933. The reversal of 21194880 is 8849112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255319 + ... + 255401.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

Almost surely, 2^21194880 is an apocalyptic number.

21194880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21194880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41126400).

21194880 is an abundant number, since it is smaller than the sum of its proper divisors (61057920).

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

21194880 is a wasteful number, since it uses less digits than its factorization.

21194880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 21194880 is about 4603.7897432441. The cubic root of 21194880 is about 276.7432184419.

The spelling of 21194880 in words is "twenty-one million, one hundred ninety-four thousand, eight hundred eighty".