1223212011 has 16 divisors (see below), whose sum is σ = 1865241600. Its totient is φ = 698491008.

The previous prime is 1223212009. The next prime is 1223212019. The reversal of 1223212011 is 1102123221.

It is not a de Polignac number, because 1223212011 - 2¹ = 1223212009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1223212019) 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, 11710 + ... + 50828.

It is an arithmetic number, because the mean of its divisors is an integer number (116577600).

Almost surely, 2^1223212011 is an apocalyptic number.

1223212011 is a deficient number, since it is larger than the sum of its proper divisors (642029589).

1223212011 is a wasteful number, since it uses less digits than its factorization.

1223212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40618.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1223212011 is about 34974.4479727701. The cubic root of 1223212011 is about 1069.4666486224.

Adding to 1223212011 its reverse (1102123221), we get a palindrome (2325335232).

The spelling of 1223212011 in words is "one billion, two hundred twenty-three million, two hundred twelve thousand, eleven".