211121131 has 16 divisors (see below), whose sum is σ = 236224800. Its totient is φ = 187342848.

The previous prime is 211121107. The next prime is 211121161. The reversal of 211121131 is 131121112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211121131 - 2⁷ = 211121003 is a prime.

It is a super-2 number, since 2×211121131² = 89144263909438322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121161) 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, 95800 + ... + 97978.

It is an arithmetic number, because the mean of its divisors is an integer number (14764050).

Almost surely, 2^211121131 is an apocalyptic number.

211121131 is a deficient number, since it is larger than the sum of its proper divisors (25103669).

211121131 is a wasteful number, since it uses less digits than its factorization.

211121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478.

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

The square root of 211121131 is about 14530.0079490687. The cubic root of 211121131 is about 595.4480827823.

Adding to 211121131 its reverse (131121112), we get a palindrome (342242243).

The spelling of 211121131 in words is "two hundred eleven million, one hundred twenty-one thousand, one hundred thirty-one".