121531621713 has 8 divisors (see below), whose sum is σ = 162059432928. Its totient is φ = 81012445824.

The previous prime is 121531621709. The next prime is 121531621721. The reversal of 121531621713 is 317126135121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121531621713 - 2² = 121531621709 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121531621753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2125920 + ... + 2182337.

It is an arithmetic number, because the mean of its divisors is an integer number (20257429116).

Almost surely, 2^121531621713 is an apocalyptic number.

It is an amenable number.

121531621713 is a deficient number, since it is larger than the sum of its proper divisors (40527811215).

121531621713 is an equidigital number, since it uses as much as digits as its factorization.

121531621713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317663.

The product of its digits is 7560, while the sum is 33.

Adding to 121531621713 its reverse (317126135121), we get a palindrome (438657756834).

The spelling of 121531621713 in words is "one hundred twenty-one billion, five hundred thirty-one million, six hundred twenty-one thousand, seven hundred thirteen".