21196560 has 320 divisors, whose sum is σ = 86851584. Its totient is φ = 4147200.

The previous prime is 21196541. The next prime is 21196561. The reversal of 21196560 is 6569112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21196561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 572862 + ... + 572898.

Almost surely, 2^21196560 is an apocalyptic number.

21196560 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 21196560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43425792).

21196560 is an abundant number, since it is smaller than the sum of its proper divisors (65655024).

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

21196560 is a wasteful number, since it uses less digits than its factorization.

21196560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21196560 is about 4603.9721980047. The cubic root of 21196560 is about 276.7505302128.

The spelling of 21196560 in words is "twenty-one million, one hundred ninety-six thousand, five hundred sixty".