11491610331021 has 4 divisors (see below), whose sum is σ = 15322147108032. Its totient is φ = 7661073554012.

The previous prime is 11491610330999. The next prime is 11491610331053. The reversal of 11491610331021 is 12013301619411.

11491610331021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11491610331021 - 2⁵ = 11491610330989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11491611331021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1915268388501 + ... + 1915268388506.

It is an arithmetic number, because the mean of its divisors is an integer number (3830536777008).

Almost surely, 2^{11491610331021} is an apocalyptic number.

It is an amenable number.

11491610331021 is a deficient number, since it is larger than the sum of its proper divisors (3830536777011).

11491610331021 is an equidigital number, since it uses as much as digits as its factorization.

11491610331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830536777010.

The product of its (nonzero) digits is 3888, while the sum is 33.

The spelling of 11491610331021 in words is "eleven trillion, four hundred ninety-one billion, six hundred ten million, three hundred thirty-one thousand, twenty-one".