21201402112 has 36 divisors (see below), whose sum is σ = 46167263856. Its totient is φ = 9636999680.

The previous prime is 21201402059. The next prime is 21201402113. The reversal of 21201402112 is 21120410212.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21201402113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3761638 + ... + 3767269.

It is an arithmetic number, because the mean of its divisors is an integer number (1282423996).

Almost surely, 2^21201402112 is an apocalyptic number.

21201402112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21201402112 is an abundant number, since it is smaller than the sum of its proper divisors (24965861744).

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

21201402112 is an equidigital number, since it uses as much as digits as its factorization.

21201402112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528934 (or 7528920 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21201402112 its reverse (21120410212), we get a palindrome (42321812324).

The spelling of 21201402112 in words is "twenty-one billion, two hundred one million, four hundred two thousand, one hundred twelve".