21074112 has 42 divisors (see below), whose sum is σ = 60406788. Its totient is φ = 7024512.

The previous prime is 21074111. The next prime is 21074117. The reversal of 21074112 is 21147012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21074111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17718 + ... + 18869.

Almost surely, 2^21074112 is an apocalyptic number.

It is an amenable number.

21074112 is an abundant number, since it is smaller than the sum of its proper divisors (39332676).

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

21074112 is a wasteful number, since it uses less digits than its factorization.

21074112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36605 (or 36592 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21074112 is about 4590.6548552467. The cubic root of 21074112 is about 276.2165911701.

Subtracting 21074112 from its reverse (21147012), we obtain a square (72900 = 270²).

The spelling of 21074112 in words is "twenty-one million, seventy-four thousand, one hundred twelve".