1211131012 has 24 divisors (see below), whose sum is σ = 2608590656. Its totient is φ = 479128608.

The previous prime is 1211131007. The next prime is 1211131013. The reversal of 1211131012 is 2101311121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1211130983 and 1211131001.

It is not an unprimeable number, because it can be changed into a prime (1211131013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1663278 + ... + 1664005.

Almost surely, 2^1211131012 is an apocalyptic number.

It is an amenable number.

1211131012 is an abundant number, since it is smaller than the sum of its proper divisors (1397459644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211131012 is a wasteful number, since it uses less digits than its factorization.

1211131012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327307 (or 3327305 counting only the distinct ones).

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

The square root of 1211131012 is about 34801.3076191111. The cubic root of 1211131012 is about 1065.9341468494.

Adding to 1211131012 its reverse (2101311121), we get a palindrome (3312442133).

The spelling of 1211131012 in words is "one billion, two hundred eleven million, one hundred thirty-one thousand, twelve".