21196144 has 40 divisors (see below), whose sum is σ = 43858800. Its totient is φ = 9888768.

The previous prime is 21196103. The next prime is 21196159. The reversal of 21196144 is 44169112.

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, 40267 + ... + 40789.

It is an arithmetic number, because the mean of its divisors is an integer number (1096470).

Almost surely, 2^21196144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21196144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21929400).

21196144 is an abundant number, since it is smaller than the sum of its proper divisors (22662656).

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

21196144 is a wasteful number, since it uses less digits than its factorization.

21196144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 691 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 21196144 is about 4603.9270194042. The cubic root of 21196144 is about 276.7487197150.

The spelling of 21196144 in words is "twenty-one million, one hundred ninety-six thousand, one hundred forty-four".