21249112 has 16 divisors (see below), whose sum is σ = 41216400. Its totient is φ = 10258080.

The previous prime is 21249103. The next prime is 21249119. The reversal of 21249112 is 21194212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21249119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45564 + ... + 46027.

It is an arithmetic number, because the mean of its divisors is an integer number (2576025).

Almost surely, 2^21249112 is an apocalyptic number.

It is an amenable number.

21249112 is a deficient number, since it is larger than the sum of its proper divisors (19967288).

21249112 is a wasteful number, since it uses less digits than its factorization.

21249112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91626 (or 91622 counting only the distinct ones).

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

The square root of 21249112 is about 4609.6759105169. The cubic root of 21249112 is about 276.9790545749.

It can be divided in two parts, 2124 and 9112, that added together give a square (11236 = 106²).

The spelling of 21249112 in words is "twenty-one million, two hundred forty-nine thousand, one hundred twelve".