21200444133 has 16 divisors (see below), whose sum is σ = 32650952256. Its totient is φ = 12092944640.

The previous prime is 21200444117. The next prime is 21200444141. The reversal of 21200444133 is 33144400212.

It is a cyclic number.

It is not a de Polignac number, because 21200444133 - 2⁴ = 21200444117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200444183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18894666 + ... + 18895787.

It is an arithmetic number, because the mean of its divisors is an integer number (2040684516).

Almost surely, 2^21200444133 is an apocalyptic number.

It is an amenable number.

21200444133 is a deficient number, since it is larger than the sum of its proper divisors (11450508123).

21200444133 is a wasteful number, since it uses less digits than its factorization.

21200444133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37790484.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21200444133 its reverse (33144400212), we get a palindrome (54344844345).

The spelling of 21200444133 in words is "twenty-one billion, two hundred million, four hundred forty-four thousand, one hundred thirty-three".