21033131013 has 6 divisors (see below), whose sum is σ = 30381189254. Its totient is φ = 14022087336.

The previous prime is 21033130973. The next prime is 21033131027. The reversal of 21033131013 is 31013133012.

It is a happy number.

21033131013 is a `hidden beast` number, since 2 + 10 + 331 + 310 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19448533764 + 1584597249 = 139458^2 + 39807^2 .

It is not a de Polignac number, because 21033131013 - 2⁸ = 21033130757 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 (21033131033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1168507270 + ... + 1168507287.

Almost surely, 2^21033131013 is an apocalyptic number.

It is an amenable number.

21033131013 is a deficient number, since it is larger than the sum of its proper divisors (9348058241).

21033131013 is a wasteful number, since it uses less digits than its factorization.

21033131013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337014563 (or 2337014560 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21033131013 its reverse (31013133012), we get a palindrome (52046264025).

It can be divided in two parts, 2103313 and 1013, that added together give a triangular number (2104326 = T₂₀₅₁).

The spelling of 21033131013 in words is "twenty-one billion, thirty-three million, one hundred thirty-one thousand, thirteen".