21231201133133 has 4 divisors (see below), whose sum is σ = 21231394213728. Its totient is φ = 21231008052540.

The previous prime is 21231201133069. The next prime is 21231201133193. The reversal of 21231201133133 is 33133110213212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21231201133133 - 2⁶ = 21231201133069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231201133193) 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, 96375263 + ... + 96595308.

It is an arithmetic number, because the mean of its divisors is an integer number (5307848553432).

Almost surely, 2^{21231201133133} is an apocalyptic number.

It is an amenable number.

21231201133133 is a deficient number, since it is larger than the sum of its proper divisors (193080595).

21231201133133 is a wasteful number, since it uses less digits than its factorization.

21231201133133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193080594.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21231201133133 its reverse (33133110213212), we get a palindrome (54364311346345).

The spelling of 21231201133133 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred one million, one hundred thirty-three thousand, one hundred thirty-three".