21000131333 has 4 divisors (see below), whose sum is σ = 21006298560. Its totient is φ = 20993964108.

The previous prime is 21000131309. The next prime is 21000131351. The reversal of 21000131333 is 33313100012.

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 21000131333 - 2¹⁰ = 21000130309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000131363) 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, 3078503 + ... + 3085316.

It is an arithmetic number, because the mean of its divisors is an integer number (5251574640).

Almost surely, 2^21000131333 is an apocalyptic number.

It is an amenable number.

21000131333 is a deficient number, since it is larger than the sum of its proper divisors (6167227).

21000131333 is an equidigital number, since it uses as much as digits as its factorization.

21000131333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6167226.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21000131333 its reverse (33313100012), we get a palindrome (54313231345).

The spelling of 21000131333 in words is "twenty-one billion, one hundred thirty-one thousand, three hundred thirty-three".