21341880 has 160 divisors (see below), whose sum is σ = 82067040. Its totient is φ = 4872960.

The previous prime is 21341867. The next prime is 21341897. The reversal of 21341880 is 8814312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22210 + ... + 23150.

It is an arithmetic number, because the mean of its divisors is an integer number (512919).

Almost surely, 2^21341880 is an apocalyptic number.

21341880 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 21341880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41033520).

21341880 is an abundant number, since it is smaller than the sum of its proper divisors (60725160).

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

21341880 is a wasteful number, since it uses less digits than its factorization.

21341880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21341880 is about 4619.7272646770. The cubic root of 21341880 is about 277.3815418434.

The spelling of 21341880 in words is "twenty-one million, three hundred forty-one thousand, eight hundred eighty".