21200134401 has 8 divisors (see below), whose sum is σ = 31407606560. Its totient is φ = 14133422916.

The previous prime is 21200134363. The next prime is 21200134411. The reversal of 21200134401 is 10443100212.

21200134401 is a `hidden beast` number, since 21 + 200 + 1 + 3 + 440 + 1 = 666.

It is not a de Polignac number, because 21200134401 - 2²² = 21195940097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200134411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392595055 + ... + 392595108.

It is an arithmetic number, because the mean of its divisors is an integer number (3925950820).

Almost surely, 2^21200134401 is an apocalyptic number.

It is an amenable number.

21200134401 is a deficient number, since it is larger than the sum of its proper divisors (10207472159).

21200134401 is an equidigital number, since it uses as much as digits as its factorization.

21200134401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785190172 (or 785190166 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21200134401 its reverse (10443100212), we get a palindrome (31643234613).

The spelling of 21200134401 in words is "twenty-one billion, two hundred million, one hundred thirty-four thousand, four hundred one".