21353451112 has 64 divisors (see below), whose sum is σ = 49074595200. Its totient is φ = 8506218240.

The previous prime is 21353451101. The next prime is 21353451127. The reversal of 21353451112 is 21115435312.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 132939 + ... + 245722.

It is an arithmetic number, because the mean of its divisors is an integer number (766790550).

Almost surely, 2^21353451112 is an apocalyptic number.

It is an amenable number.

21353451112 is an abundant number, since it is smaller than the sum of its proper divisors (27721144088).

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

21353451112 is a wasteful number, since it uses less digits than its factorization.

21353451112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378746 (or 378742 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

Adding to 21353451112 its reverse (21115435312), we get a palindrome (42468886424).

The spelling of 21353451112 in words is "twenty-one billion, three hundred fifty-three million, four hundred fifty-one thousand, one hundred twelve".