21052112 has 40 divisors (see below), whose sum is σ = 42916896. Its totient is φ = 9991296.

The previous prime is 21052111. The next prime is 21052117. The reversal of 21052112 is 21125012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25043 + ... + 25869.

Almost surely, 2^21052112 is an apocalyptic number.

It is an amenable number.

21052112 is an abundant number, since it is smaller than the sum of its proper divisors (21864784).

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

21052112 is a wasteful number, since it uses less digits than its factorization.

21052112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21052112 is about 4588.2580572588. The cubic root of 21052112 is about 276.1204403285.

Adding to 21052112 its reverse (21125012), we get a palindrome (42177124).

Subtracting 21052112 from its reverse (21125012), we obtain a square (72900 = 270²).

It can be divided in two parts, 210521 and 12, that multiplied together give a palindrome (2526252).

The spelling of 21052112 in words is "twenty-one million, fifty-two thousand, one hundred twelve".