121762720113 has 4 divisors (see below), whose sum is σ = 162350293488. Its totient is φ = 81175146740.

The previous prime is 121762720109. The next prime is 121762720127. The reversal of 121762720113 is 311027267121.

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 121762720113 - 2² = 121762720109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121762720213) 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, 20293786683 + ... + 20293786688.

It is an arithmetic number, because the mean of its divisors is an integer number (40587573372).

Almost surely, 2^121762720113 is an apocalyptic number.

It is an amenable number.

121762720113 is a deficient number, since it is larger than the sum of its proper divisors (40587573375).

121762720113 is an equidigital number, since it uses as much as digits as its factorization.

121762720113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40587573374.

The product of its (nonzero) digits is 7056, while the sum is 33.

Adding to 121762720113 its reverse (311027267121), we get a palindrome (432789987234).

The spelling of 121762720113 in words is "one hundred twenty-one billion, seven hundred sixty-two million, seven hundred twenty thousand, one hundred thirteen".