21141912 has 64 divisors (see below), whose sum is σ = 58786560. Its totient is φ = 6281600.

The previous prime is 21141893. The next prime is 21141941. The reversal of 21141912 is 21914112.

It is a happy number.

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, 13237 + ... + 14747.

It is an arithmetic number, because the mean of its divisors is an integer number (918540).

Almost surely, 2^21141912 is an apocalyptic number.

21141912 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 21141912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29393280).

21141912 is an abundant number, since it is smaller than the sum of its proper divisors (37644648).

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

21141912 is a wasteful number, since it uses less digits than its factorization.

21141912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584 (or 1580 counting only the distinct ones).

The product of its digits is 144, while the sum is 21.

The square root of 21141912 is about 4598.0334927010. The cubic root of 21141912 is about 276.5124903478.

The spelling of 21141912 in words is "twenty-one million, one hundred forty-one thousand, nine hundred twelve".