21142529112 has 128 divisors (see below), whose sum is σ = 55934841600. Its totient is φ = 6649843200.

The previous prime is 21142529087. The next prime is 21142529137. The reversal of 21142529112 is 21192524112.

It is an interprime number because it is at equal distance from previous prime (21142529087) and next prime (21142529137).

It is a self number, because there is not a number n which added to its sum of digits gives 21142529112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6107062 + ... + 6110522.

It is an arithmetic number, because the mean of its divisors is an integer number (436990950).

Almost surely, 2^21142529112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21142529112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27967420800).

21142529112 is an abundant number, since it is smaller than the sum of its proper divisors (34792312488).

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

21142529112 is a wasteful number, since it uses less digits than its factorization.

21142529112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697 (or 3693 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

Subtracting 21142529112 from its reverse (21192524112), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 21142529112 in words is "twenty-one billion, one hundred forty-two million, five hundred twenty-nine thousand, one hundred twelve".