121013531553 has 8 divisors (see below), whose sum is σ = 161353542400. Its totient is φ = 80674604208.

The previous prime is 121013531549. The next prime is 121013531599. The reversal of 121013531553 is 355135310121.

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

It is not a de Polignac number, because 121013531553 - 2² = 121013531549 is a prime.

It is a super-4 number, since 4×121013531553⁴ (a number of 45 digits) contains 4444 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 121013531553.

It is not an unprimeable number, because it can be changed into a prime (121013531533) 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, 41043 + ... + 493671.

It is an arithmetic number, because the mean of its divisors is an integer number (20169192800).

Almost surely, 2^121013531553 is an apocalyptic number.

It is an amenable number.

121013531553 is a deficient number, since it is larger than the sum of its proper divisors (40340010847).

121013531553 is an equidigital number, since it uses as much as digits as its factorization.

121013531553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541751.

The product of its (nonzero) digits is 6750, while the sum is 30.

Adding to 121013531553 its reverse (355135310121), we get a palindrome (476148841674).

The spelling of 121013531553 in words is "one hundred twenty-one billion, thirteen million, five hundred thirty-one thousand, five hundred fifty-three".