121213131 has 32 divisors (see below), whose sum is σ = 181536768. Its totient is φ = 71435520.

The previous prime is 121213129. The next prime is 121213163. The reversal of 121213131 is 131312121.

It is a happy number.

It is not a de Polignac number, because 121213131 - 2¹ = 121213129 is a prime.

It is a super-2 number, since 2×121213131² = 29385246253646322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121213131.

It is not an unprimeable number, because it can be changed into a prime (121213031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128895 + ... + 129831.

It is an arithmetic number, because the mean of its divisors is an integer number (5673024).

Almost surely, 2^121213131 is an apocalyptic number.

121213131 is a deficient number, since it is larger than the sum of its proper divisors (60323637).

121213131 is a wasteful number, since it uses less digits than its factorization.

121213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091.

The product of its digits is 36, while the sum is 15.

The square root of 121213131 is about 11009.6835104375. The cubic root of 121213131 is about 494.8989774455.

Adding to 121213131 its reverse (131312121), we get a palindrome (252525252).

The spelling of 121213131 in words is "one hundred twenty-one million, two hundred thirteen thousand, one hundred thirty-one".