21630401112 has 128 divisors (see below), whose sum is σ = 59584377600. Its totient is φ = 6515539968.

The previous prime is 21630401101. The next prime is 21630401159. The reversal of 21630401112 is 21110403612.

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, 1024648 + ... + 1045544.

It is an arithmetic number, because the mean of its divisors is an integer number (465502950).

Almost surely, 2^21630401112 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 21630401112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29792188800).

21630401112 is an abundant number, since it is smaller than the sum of its proper divisors (37953976488).

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

21630401112 is a wasteful number, since it uses less digits than its factorization.

21630401112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21025 (or 21021 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21630401112 its reverse (21110403612), we get a palindrome (42740804724).

The spelling of 21630401112 in words is "twenty-one billion, six hundred thirty million, four hundred one thousand, one hundred twelve".