1211320011 has 32 divisors (see below), whose sum is σ = 1788853248. Its totient is φ = 722971040.

The previous prime is 1211320007. The next prime is 1211320027. The reversal of 1211320011 is 1100231121.

It is not a de Polignac number, because 1211320011 - 2² = 1211320007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211320811) 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, 1278640 + ... + 1279586.

It is an arithmetic number, because the mean of its divisors is an integer number (55901664).

Almost surely, 2^1211320011 is an apocalyptic number.

1211320011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211320011 is a deficient number, since it is larger than the sum of its proper divisors (577533237).

1211320011 is a wasteful number, since it uses less digits than its factorization.

1211320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511.

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

The square root of 1211320011 is about 34804.0229140253. The cubic root of 1211320011 is about 1065.9895908951.

Adding to 1211320011 its reverse (1100231121), we get a palindrome (2311551132).

The spelling of 1211320011 in words is "one billion, two hundred eleven million, three hundred twenty thousand, eleven".