21873260 has 12 divisors (see below), whose sum is σ = 45933888. Its totient is φ = 8749296.

The previous prime is 21873251. The next prime is 21873277. The reversal of 21873260 is 6237812.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546812 + ... + 546851.

It is an arithmetic number, because the mean of its divisors is an integer number (3827824).

Almost surely, 2^21873260 is an apocalyptic number.

21873260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21873260 is an abundant number, since it is smaller than the sum of its proper divisors (24060628).

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

21873260 is a wasteful number, since it uses less digits than its factorization.

21873260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093672 (or 1093670 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21873260 is about 4676.8857159439. The cubic root of 21873260 is about 279.6648200142.

The spelling of 21873260 in words is "twenty-one million, eight hundred seventy-three thousand, two hundred sixty".