21195960 has 64 divisors (see below), whose sum is σ = 64018080. Its totient is φ = 5614080.

The previous prime is 21195899. The next prime is 21195989. The reversal of 21195960 is 6959112.

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, 20250 + ... + 21270.

Almost surely, 2^21195960 is an apocalyptic number.

21195960 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 21195960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32009040).

21195960 is an abundant number, since it is smaller than the sum of its proper divisors (42822120).

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

21195960 is a wasteful number, since it uses less digits than its factorization.

21195960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208 (or 1204 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 21195960 is about 4603.9070364203. The cubic root of 21195960 is about 276.7479189104.

It can be divided in two parts, 21195 and 960, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 21195960 in words is "twenty-one million, one hundred ninety-five thousand, nine hundred sixty".