21196912 has 40 divisors (see below), whose sum is σ = 46358640. Its totient is φ = 9300480.

The previous prime is 21196907. The next prime is 21196919. The reversal of 21196912 is 21969112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21196919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3028 + ... + 7180.

It is an arithmetic number, because the mean of its divisors is an integer number (1158966).

Almost surely, 2^21196912 is an apocalyptic number.

21196912 is a gapful number since it is divisible by the number (22) 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 21196912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23179320).

21196912 is an abundant number, since it is smaller than the sum of its proper divisors (25161728).

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

21196912 is a wasteful number, since it uses less digits than its factorization.

21196912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201 (or 4195 counting only the distinct ones).

The product of its digits is 1944, while the sum is 31.

The square root of 21196912 is about 4604.0104257050. The cubic root of 21196912 is about 276.7520621540.

The spelling of 21196912 in words is "twenty-one million, one hundred ninety-six thousand, nine hundred twelve".