21512425401112 has 32 divisors (see below), whose sum is σ = 43092446817600. Its totient is φ = 10038005249184.

The previous prime is 21512425401091. The next prime is 21512425401119. The reversal of 21512425401112 is 21110452421512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512425401119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1056177238 + ... + 1056197605.

It is an arithmetic number, because the mean of its divisors is an integer number (1346638963050).

Almost surely, 2^{21512425401112} is an apocalyptic number.

It is an amenable number.

21512425401112 is an abundant number, since it is smaller than the sum of its proper divisors (21580021416488).

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

21512425401112 is a wasteful number, since it uses less digits than its factorization.

21512425401112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112374935 (or 2112374931 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

Adding to 21512425401112 its reverse (21110452421512), we get a palindrome (42622877822624).

The spelling of 21512425401112 in words is "twenty-one trillion, five hundred twelve billion, four hundred twenty-five million, four hundred one thousand, one hundred twelve".