121211131 has 4 divisors (see below), whose sum is σ = 121662000. Its totient is φ = 120760264.

The previous prime is 121211113. The next prime is 121211137. The reversal of 121211131 is 131112121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121211131 - 2⁹ = 121210619 is a prime.

It is a super-2 number, since 2×121211131² = 29384276556598322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211137) 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, 225031 + ... + 225568.

It is an arithmetic number, because the mean of its divisors is an integer number (30415500).

Almost surely, 2^121211131 is an apocalyptic number.

121211131 is a deficient number, since it is larger than the sum of its proper divisors (450869).

121211131 is an equidigital number, since it uses as much as digits as its factorization.

121211131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450868.

The product of its digits is 12, while the sum is 13.

The square root of 121211131 is about 11009.5926809306. The cubic root of 121211131 is about 494.8962555089.

Adding to 121211131 its reverse (131112121), we get a palindrome (252323252).

The spelling of 121211131 in words is "one hundred twenty-one million, two hundred eleven thousand, one hundred thirty-one".