21149212 has 12 divisors (see below), whose sum is σ = 42298480. Its totient is φ = 9063936.

The previous prime is 21149197. The next prime is 21149221. The reversal of 21149212 is 21294112.

21149212 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 377637 + ... + 377692.

Almost surely, 2^21149212 is an apocalyptic number.

It is an amenable number.

21149212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21149212 is a wasteful number, since it uses less digits than its factorization.

21149212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755340 (or 755338 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 21149212 is about 4598.8272418085. The cubic root of 21149212 is about 276.5443119557.

The spelling of 21149212 in words is "twenty-one million, one hundred forty-nine thousand, two hundred twelve".