1211012131 has 16 divisors (see below), whose sum is σ = 1433615040. Its totient is φ = 1000903680.

The previous prime is 1211012113. The next prime is 1211012137. The reversal of 1211012131 is 1312101121.

It is a happy number.

It is not a de Polignac number, because 1211012131 - 2¹⁷ = 1210881059 is a prime.

It is a super-2 number, since 2×1211012131² = 2933100762858322322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211012137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170491 + ... + 177451.

It is an arithmetic number, because the mean of its divisors is an integer number (89600940).

Almost surely, 2^1211012131 is an apocalyptic number.

1211012131 is a deficient number, since it is larger than the sum of its proper divisors (222602909).

1211012131 is an equidigital number, since it uses as much as digits as its factorization.

1211012131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7854.

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

The square root of 1211012131 is about 34799.5995810297. The cubic root of 1211012131 is about 1065.8992694050.

Adding to 1211012131 its reverse (1312101121), we get a palindrome (2523113252).

The spelling of 1211012131 in words is "one billion, two hundred eleven million, twelve thousand, one hundred thirty-one".