1211234402221 has 4 divisors (see below), whose sum is σ = 1250306479744. Its totient is φ = 1172162324700.

The previous prime is 1211234402057. The next prime is 1211234402237. The reversal of 1211234402221 is 1222044321121.

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 1211234402221 - 2²⁵ = 1211200847789 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 (1211234402281) 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, 19536038715 + ... + 19536038776.

It is an arithmetic number, because the mean of its divisors is an integer number (312576619936).

Almost surely, 2^{1211234402221} is an apocalyptic number.

It is an amenable number.

1211234402221 is a deficient number, since it is larger than the sum of its proper divisors (39072077523).

1211234402221 is an equidigital number, since it uses as much as digits as its factorization.

1211234402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39072077522.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 1211234402221 its reverse (1222044321121), we get a palindrome (2433278723342).

The spelling of 1211234402221 in words is "one trillion, two hundred eleven billion, two hundred thirty-four million, four hundred two thousand, two hundred twenty-one".