21094880 has 48 divisors (see below), whose sum is σ = 51456384. Its totient is φ = 8163840.

The previous prime is 21094873. The next prime is 21094903. The reversal of 21094880 is 8849012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2834 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (1072008).

Almost surely, 2^21094880 is an apocalyptic number.

21094880 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 21094880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25728192).

21094880 is an abundant number, since it is smaller than the sum of its proper divisors (30361504).

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

21094880 is a wasteful number, since it uses less digits than its factorization.

21094880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299 (or 4291 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21094880 is about 4592.9162848892. The cubic root of 21094880 is about 276.3072961832.

The spelling of 21094880 in words is "twenty-one million, ninety-four thousand, eight hundred eighty".