21131330029 has 2 divisors, whose sum is σ = 21131330030. Its totient is φ = 21131330028.

The previous prime is 21131329993. The next prime is 21131330039. The reversal of 21131330029 is 92003313112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20337612100 + 793717929 = 142610^2 + 28173^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131330029 - 2³¹ = 18983846381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21131329985 and 21131330012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131330039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565665014 + 10565665015.

It is an arithmetic number, because the mean of its divisors is an integer number (10565665015).

Almost surely, 2^21131330029 is an apocalyptic number.

It is an amenable number.

21131330029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131330029 is an equidigital number, since it uses as much as digits as its factorization.

21131330029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 21131330029 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty thousand, twenty-nine".