121003551 has 12 divisors (see below), whose sum is σ = 181256712. Its totient is φ = 80668872.

The previous prime is 121003517. The next prime is 121003577. The reversal of 121003551 is 155300121.

121003551 is a `hidden beast` number, since 12 + 100 + 3 + 551 = 666.

It is not a de Polignac number, because 121003551 - 2¹⁰ = 121002527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121003651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248736 + ... + 249221.

It is an arithmetic number, because the mean of its divisors is an integer number (15104726).

Almost surely, 2^121003551 is an apocalyptic number.

121003551 is a deficient number, since it is larger than the sum of its proper divisors (60253161).

121003551 is an frugal number, since it uses more digits than its factorization.

121003551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497972 (or 497960 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 121003551 is about 11000.1614079067. The cubic root of 121003551 is about 494.6135827229.

Adding to 121003551 its reverse (155300121), we get a palindrome (276303672).

It can be divided in two parts, 12100 and 3551, that added together give a palindrome (15651).

The spelling of 121003551 in words is "one hundred twenty-one million, three thousand, five hundred fifty-one".