21013311029 has 2 divisors, whose sum is σ = 21013311030. Its totient is φ = 21013311028.

The previous prime is 21013311001. The next prime is 21013311047. The reversal of 21013311029 is 92011331012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12028166929 + 8985144100 = 109673^2 + 94790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21013311029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21013310995 and 21013311013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013311829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506655514 + 10506655515.

It is an arithmetic number, because the mean of its divisors is an integer number (10506655515).

Almost surely, 2^21013311029 is an apocalyptic number.

It is an amenable number.

21013311029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013311029 is an equidigital number, since it uses as much as digits as its factorization.

21013311029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21013311029 in words is "twenty-one billion, thirteen million, three hundred eleven thousand, twenty-nine".