121203131 has 16 divisors (see below), whose sum is σ = 140652288. Its totient is φ = 102300000.

The previous prime is 121203127. The next prime is 121203161. The reversal of 121203131 is 131302121.

It is a cyclic number.

It is not a de Polignac number, because 121203131 - 2² = 121203127 is a prime.

It is a super-2 number, since 2×121203131² = 29380397928406322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121203101) 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 15 ways as a sum of consecutive naturals, for example, 177116 + ... + 177798.

It is an arithmetic number, because the mean of its divisors is an integer number (8790768).

Almost surely, 2^121203131 is an apocalyptic number.

121203131 is a deficient number, since it is larger than the sum of its proper divisors (19449157).

121203131 is a wasteful number, since it uses less digits than its factorization.

121203131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 121203131 is about 11009.2293554090. The cubic root of 121203131 is about 494.8853674628.

Adding to 121203131 its reverse (131302121), we get a palindrome (252505252).

It can be divided in two parts, 12120 and 3131, that added together give a palindrome (15251).

The spelling of 121203131 in words is "one hundred twenty-one million, two hundred three thousand, one hundred thirty-one".