1211330242421 has 4 divisors (see below), whose sum is σ = 1304509491852. Its totient is φ = 1118150992992.

The previous prime is 1211330242387. The next prime is 1211330242459. The reversal of 1211330242421 is 1242420331121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 358099315396 + 853230927025 = 598414^2 + 923705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211330242421 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 (1211330242471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46589624696 + ... + 46589624721.

It is an arithmetic number, because the mean of its divisors is an integer number (326127372963).

Almost surely, 2^{1211330242421} is an apocalyptic number.

It is an amenable number.

1211330242421 is a deficient number, since it is larger than the sum of its proper divisors (93179249431).

1211330242421 is an equidigital number, since it uses as much as digits as its factorization.

1211330242421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93179249430.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 1211330242421 its reverse (1242420331121), we get a palindrome (2453750573542).

The spelling of 1211330242421 in words is "one trillion, two hundred eleven billion, three hundred thirty million, two hundred forty-two thousand, four hundred twenty-one".