21131231333 has 8 divisors (see below), whose sum is σ = 21317835840. Its totient is φ = 20945121120.

The previous prime is 21131231323. The next prime is 21131231377. The reversal of 21131231333 is 33313213112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21131231333 - 2¹² = 21131227237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131231299 and 21131231308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131231323) 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, 37433 + ... + 208958.

It is an arithmetic number, because the mean of its divisors is an integer number (2664729480).

Almost surely, 2^21131231333 is an apocalyptic number.

It is an amenable number.

21131231333 is a deficient number, since it is larger than the sum of its proper divisors (186604507).

21131231333 is a wasteful number, since it uses less digits than its factorization.

21131231333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247147.

The product of its digits is 972, while the sum is 23.

Adding to 21131231333 its reverse (33313213112), we get a palindrome (54444444445).

The spelling of 21131231333 in words is "twenty-one billion, one hundred thirty-one million, two hundred thirty-one thousand, three hundred thirty-three".