1211332013 has 4 divisors (see below), whose sum is σ = 1234187388. Its totient is φ = 1188476640.

The previous prime is 1211331977. The next prime is 1211332021. The reversal of 1211332013 is 3102331121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3102331121 = 433 ⋅7164737.

It can be written as a sum of positive squares in 2 ways, for example, as 534395689 + 676936324 = 23117^2 + 26018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211332013 - 2¹⁶ = 1211266477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211331982 and 1211332000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211332033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11427608 + ... + 11427713.

It is an arithmetic number, because the mean of its divisors is an integer number (308546847).

Almost surely, 2^1211332013 is an apocalyptic number.

It is an amenable number.

1211332013 is a deficient number, since it is larger than the sum of its proper divisors (22855375).

1211332013 is an equidigital number, since it uses as much as digits as its factorization.

1211332013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22855374.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1211332013 is about 34804.1953361947. The cubic root of 1211332013 is about 1065.9931115625.

Adding to 1211332013 its reverse (3102331121), we get a palindrome (4313663134).

The spelling of 1211332013 in words is "one billion, two hundred eleven million, three hundred thirty-two thousand, thirteen".