13214115821 has 2 divisors, whose sum is σ = 13214115822. Its totient is φ = 13214115820.

The previous prime is 13214115791. The next prime is 13214115853. The reversal of 13214115821 is 12851141231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13009911721 + 204204100 = 114061^2 + 14290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13214115821 is a prime.

It is a super-2 number, since 2×13214115821² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13214115721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6607057910 + 6607057911.

It is an arithmetic number, because the mean of its divisors is an integer number (6607057911).

Almost surely, 2^13214115821 is an apocalyptic number.

It is an amenable number.

13214115821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13214115821 is an equidigital number, since it uses as much as digits as its factorization.

13214115821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 29.

The spelling of 13214115821 in words is "thirteen billion, two hundred fourteen million, one hundred fifteen thousand, eight hundred twenty-one".