21424252112112 has 80 divisors (see below), whose sum is σ = 55465945666560. Its totient is φ = 7125951261696.

The previous prime is 21424252112093. The next prime is 21424252112149. The reversal of 21424252112112 is 21121125242412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21424252112112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53967208 + ... + 54362744.

It is an arithmetic number, because the mean of its divisors is an integer number (693324320832).

Almost surely, 2^{21424252112112} is an apocalyptic number.

It is an amenable number.

21424252112112 is an abundant number, since it is smaller than the sum of its proper divisors (34041693554448).

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

21424252112112 is a wasteful number, since it uses less digits than its factorization.

21424252112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397990 (or 397984 counting only the distinct ones).

The product of its digits is 5120, while the sum is 30.

Adding to 21424252112112 its reverse (21121125242412), we get a palindrome (42545377354524).

The spelling of 21424252112112 in words is "twenty-one trillion, four hundred twenty-four billion, two hundred fifty-two million, one hundred twelve thousand, one hundred twelve".