21119880 has 64 divisors (see below), whose sum is σ = 64848960. Its totient is φ = 5499648.

The previous prime is 21119869. The next prime is 21119909. The reversal of 21119880 is 8891112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3114 + ... + 7206.

It is an arithmetic number, because the mean of its divisors is an integer number (1013265).

Almost surely, 2^21119880 is an apocalyptic number.

21119880 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 21119880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32424480).

21119880 is an abundant number, since it is smaller than the sum of its proper divisors (43729080).

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

21119880 is a wasteful number, since it uses less digits than its factorization.

21119880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150 (or 4146 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 21119880 is about 4595.6370613877. The cubic root of 21119880 is about 276.4164056825.

The spelling of 21119880 in words is "twenty-one million, one hundred nineteen thousand, eight hundred eighty".