21112505412 has 24 divisors (see below), whose sum is σ = 50961220800. Its totient is φ = 6794829216.

The previous prime is 21112505369. The next prime is 21112505417. The reversal of 21112505412 is 21450521112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21112505417) 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, 30333712 + ... + 30334407.

It is an arithmetic number, because the mean of its divisors is an integer number (2123384200).

Almost surely, 2^21112505412 is an apocalyptic number.

It is an amenable number.

21112505412 is an abundant number, since it is smaller than the sum of its proper divisors (29848715388).

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

21112505412 is a wasteful number, since it uses less digits than its factorization.

21112505412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60668155 (or 60668153 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The spelling of 21112505412 in words is "twenty-one billion, one hundred twelve million, five hundred five thousand, four hundred twelve".