121533120613 has 4 divisors (see below), whose sum is σ = 121535366400. Its totient is φ = 121530874828.

The previous prime is 121533120587. The next prime is 121533120617. The reversal of 121533120613 is 316021335121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 316021335121 = 160001 ⋅1975121.

It is a cyclic number.

It is not a de Polignac number, because 121533120613 - 2⁹ = 121533120101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121533120617) 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, 1039663 + ... + 1150636.

It is an arithmetic number, because the mean of its divisors is an integer number (30383841600).

Almost surely, 2^121533120613 is an apocalyptic number.

It is an amenable number.

121533120613 is a deficient number, since it is larger than the sum of its proper divisors (2245787).

121533120613 is an equidigital number, since it uses as much as digits as its factorization.

121533120613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245786.

The product of its (nonzero) digits is 3240, while the sum is 28.

Adding to 121533120613 its reverse (316021335121), we get a palindrome (437554455734).

The spelling of 121533120613 in words is "one hundred twenty-one billion, five hundred thirty-three million, one hundred twenty thousand, six hundred thirteen".