1211332221013 has 4 divisors (see below), whose sum is σ = 1237105247040. Its totient is φ = 1185559194988.

The previous prime is 1211332220963. The next prime is 1211332221017. The reversal of 1211332221013 is 3101222331121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211332221013 - 2¹³ = 1211332212821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211332221017) 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, 12886512943 + ... + 12886513036.

It is an arithmetic number, because the mean of its divisors is an integer number (309276311760).

Almost surely, 2^{1211332221013} is an apocalyptic number.

It is an amenable number.

1211332221013 is a deficient number, since it is larger than the sum of its proper divisors (25773026027).

1211332221013 is an equidigital number, since it uses as much as digits as its factorization.

1211332221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25773026026.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1211332221013 its reverse (3101222331121), we get a palindrome (4312554552134).

The spelling of 1211332221013 in words is "one trillion, two hundred eleven billion, three hundred thirty-two million, two hundred twenty-one thousand, thirteen".