21131333332 has 6 divisors (see below), whose sum is σ = 36979833338. Its totient is φ = 10565666664.

The previous prime is 21131333273. The next prime is 21131333347. The reversal of 21131333332 is 23333313112.

It can be written as a sum of positive squares in only one way, i.e., 20737152016 + 394181316 = 144004^2 + 19854^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21131333297 and 21131333306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641416663 + ... + 2641416670.

Almost surely, 2^21131333332 is an apocalyptic number.

It is an amenable number.

21131333332 is a deficient number, since it is larger than the sum of its proper divisors (15848500006).

21131333332 is a wasteful number, since it uses less digits than its factorization.

21131333332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282833337 (or 5282833335 counting only the distinct ones).

The product of its digits is 2916, while the sum is 25.

Adding to 21131333332 its reverse (23333313112), we get a palindrome (44464646444).

The spelling of 21131333332 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty-three thousand, three hundred thirty-two".