121211233013 has 4 divisors (see below), whose sum is σ = 130535174028. Its totient is φ = 111887292000.

The previous prime is 121211233009. The next prime is 121211233021. The reversal of 121211233013 is 310332112121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21066200164 + 100145032849 = 145142^2 + 316457^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211233013 - 2² = 121211233009 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 (121211230013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4661970488 + ... + 4661970513.

It is an arithmetic number, because the mean of its divisors is an integer number (32633793507).

Almost surely, 2^121211233013 is an apocalyptic number.

121211233013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121211233013 is a deficient number, since it is larger than the sum of its proper divisors (9323941015).

121211233013 is an equidigital number, since it uses as much as digits as its factorization.

121211233013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9323941014.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121211233013 its reverse (310332112121), we get a palindrome (431543345134).

The spelling of 121211233013 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thirty-three thousand, thirteen".