1231213011 has 32 divisors (see below), whose sum is σ = 1893749760. Its totient is φ = 696976896.

The previous prime is 1231213007. The next prime is 1231213033. The reversal of 1231213011 is 1103121321.

It is a happy number.

It is not a de Polignac number, because 1231213011 - 2² = 1231213007 is a prime.

It is a super-2 number, since 2×1231213011² = 3031770956911372242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231213051) 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, 1995175 + ... + 1995791.

It is an arithmetic number, because the mean of its divisors is an integer number (59179680).

Almost surely, 2^1231213011 is an apocalyptic number.

1231213011 is a deficient number, since it is larger than the sum of its proper divisors (662536749).

1231213011 is a wasteful number, since it uses less digits than its factorization.

1231213011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

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

The square root of 1231213011 is about 35088.6450436605. The cubic root of 1231213011 is about 1071.7933680757.

Adding to 1231213011 its reverse (1103121321), we get a palindrome (2334334332).

The spelling of 1231213011 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, eleven".