121215486551 has 8 divisors (see below), whose sum is σ = 122588056800. Its totient is φ = 119843152000.

The previous prime is 121215486533. The next prime is 121215486611. The reversal of 121215486551 is 155684512121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121215486551 - 2⁶ = 121215486487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121215486499 and 121215486508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121215486451) 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, 1104710 + ... + 1209468.

It is an arithmetic number, because the mean of its divisors is an integer number (15323507100).

Almost surely, 2^121215486551 is an apocalyptic number.

121215486551 is a deficient number, since it is larger than the sum of its proper divisors (1372570249).

121215486551 is a wasteful number, since it uses less digits than its factorization.

121215486551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117849.

The product of its digits is 96000, while the sum is 41.

Adding to 121215486551 its reverse (155684512121), we get a palindrome (276899998672).

The spelling of 121215486551 in words is "one hundred twenty-one billion, two hundred fifteen million, four hundred eighty-six thousand, five hundred fifty-one".