21949912 has 16 divisors (see below), whose sum is σ = 42945840. Its totient is φ = 10497696.

The previous prime is 21949877. The next prime is 21949927. The reversal of 21949912 is 21994912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59463 + ... + 59830.

It is an arithmetic number, because the mean of its divisors is an integer number (2684115).

Almost surely, 2^21949912 is an apocalyptic number.

It is an amenable number.

21949912 is a deficient number, since it is larger than the sum of its proper divisors (20995928).

21949912 is a wasteful number, since it uses less digits than its factorization.

21949912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119322 (or 119318 counting only the distinct ones).

The product of its digits is 11664, while the sum is 37.

The square root of 21949912 is about 4685.0733185298. The cubic root of 21949912 is about 279.9911221675.

The spelling of 21949912 in words is "twenty-one million, nine hundred forty-nine thousand, nine hundred twelve".