13113211021 has 2 divisors, whose sum is σ = 13113211022. Its totient is φ = 13113211020.

The previous prime is 13113210973. The next prime is 13113211043. The reversal of 13113211021 is 12011231131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12451435396 + 661775625 = 111586^2 + 25725^2 .

It is a cyclic number.

It is not a de Polignac number, because 13113211021 - 2²³ = 13104822413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13113210986 and 13113211004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13113211091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6556605510 + 6556605511.

It is an arithmetic number, because the mean of its divisors is an integer number (6556605511).

Almost surely, 2^13113211021 is an apocalyptic number.

It is an amenable number.

13113211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13113211021 is an equidigital number, since it uses as much as digits as its factorization.

13113211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 13113211021 its reverse (12011231131), we get a palindrome (25124442152).

The spelling of 13113211021 in words is "thirteen billion, one hundred thirteen million, two hundred eleven thousand, twenty-one".