121355320231 has 16 divisors (see below), whose sum is σ = 124175220480. Its totient is φ = 118567895040.

The previous prime is 121355320193. The next prime is 121355320237. The reversal of 121355320231 is 132023553121.

It is a cyclic number.

It is not a de Polignac number, because 121355320231 - 2¹⁷ = 121355189159 is a prime.

It is a super-2 number, since 2×121355320231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121355320231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121355320237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22178826 + ... + 22184296.

It is an arithmetic number, because the mean of its divisors is an integer number (7760951280).

Almost surely, 2^121355320231 is an apocalyptic number.

121355320231 is a deficient number, since it is larger than the sum of its proper divisors (2819900249).

121355320231 is a wasteful number, since it uses less digits than its factorization.

121355320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 121355320231 its reverse (132023553121), we get a palindrome (253378873352).

The spelling of 121355320231 in words is "one hundred twenty-one billion, three hundred fifty-five million, three hundred twenty thousand, two hundred thirty-one".