13021111011949 has 2 divisors, whose sum is σ = 13021111011950. Its totient is φ = 13021111011948.

The previous prime is 13021111011941. The next prime is 13021111012051. The reversal of 13021111011949 is 94911011112031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10730374275625 + 2290736736324 = 3275725^2 + 1513518^2 .

It is a cyclic number.

It is not a de Polignac number, because 13021111011949 - 2³ = 13021111011941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13021111011941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6510555505974 + 6510555505975.

It is an arithmetic number, because the mean of its divisors is an integer number (6510555505975).

Almost surely, 2^{13021111011949} is an apocalyptic number.

It is an amenable number.

13021111011949 is a deficient number, since it is larger than the sum of its proper divisors (1).

13021111011949 is an equidigital number, since it uses as much as digits as its factorization.

13021111011949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 34.

The spelling of 13021111011949 in words is "thirteen trillion, twenty-one billion, one hundred eleven million, eleven thousand, nine hundred forty-nine".