21110012 has 24 divisors (see below), whose sum is σ = 46058880. Its totient is φ = 8224560.

The previous prime is 21109987. The next prime is 21110027. The reversal of 21110012 is 21001112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33962 + ... + 34577.

It is an arithmetic number, because the mean of its divisors is an integer number (1919120).

Almost surely, 2^21110012 is an apocalyptic number.

21110012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21110012 is an abundant number, since it is smaller than the sum of its proper divisors (24948868).

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

21110012 is a wasteful number, since it uses less digits than its factorization.

21110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68561 (or 68559 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 21110012 is about 4594.5633089555. The cubic root of 21110012 is about 276.3733482721.

Adding to 21110012 its reverse (21001112), we get a palindrome (42111124).

Subtracting from 21110012 its reverse (21001112), we obtain a square (108900 = 330²).

It can be divided in two parts, 211100 and 12, that added together give a palindrome (211112).

The spelling of 21110012 in words is "twenty-one million, one hundred ten thousand, twelve".