21131133331 has 48 divisors (see below), whose sum is σ = 28502033760. Its totient is φ = 15437829120.

The previous prime is 21131133319. The next prime is 21131133341. The reversal of 21131133331 is 13333113112.

It is not a de Polignac number, because 21131133331 - 2⁵ = 21131133299 is a prime.

It is a super-2 number, since 2×21131133331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131133341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2460561 + ... + 2469133.

It is an arithmetic number, because the mean of its divisors is an integer number (593792370).

Almost surely, 2^21131133331 is an apocalyptic number.

21131133331 is a deficient number, since it is larger than the sum of its proper divisors (7370900429).

21131133331 is a wasteful number, since it uses less digits than its factorization.

21131133331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8884 (or 8877 counting only the distinct ones).

The product of its digits is 486, while the sum is 22.

Adding to 21131133331 its reverse (13333113112), we get a palindrome (34464246443).

The spelling of 21131133331 in words is "twenty-one billion, one hundred thirty-one million, one hundred thirty-three thousand, three hundred thirty-one".