121145023555 has 4 divisors (see below), whose sum is σ = 145374028272. Its totient is φ = 96916018840.

The previous prime is 121145023553. The next prime is 121145023561. The reversal of 121145023555 is 555320541121.

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

It is not a de Polignac number, because 121145023555 - 2¹ = 121145023553 is a prime.

It is a super-3 number, since 3×121145023555³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 121145023555.

It is not an unprimeable number, because it can be changed into a prime (121145023553) 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, 12114502351 + ... + 12114502360.

It is an arithmetic number, because the mean of its divisors is an integer number (36343507068).

Almost surely, 2^121145023555 is an apocalyptic number.

121145023555 is a deficient number, since it is larger than the sum of its proper divisors (24229004717).

121145023555 is an equidigital number, since it uses as much as digits as its factorization.

121145023555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24229004716.

The product of its (nonzero) digits is 30000, while the sum is 34.

Adding to 121145023555 its reverse (555320541121), we get a palindrome (676465564676).

The spelling of 121145023555 in words is "one hundred twenty-one billion, one hundred forty-five million, twenty-three thousand, five hundred fifty-five".