1211224304021 has 4 divisors (see below), whose sum is σ = 1211527949100. Its totient is φ = 1210920658944.

The previous prime is 1211224303999. The next prime is 1211224304047. The reversal of 1211224304021 is 1204034221121.

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 395941719121 + 815282584900 = 629239^2 + 902930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211224304021 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 (1211224304621) 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, 151816556 + ... + 151824533.

It is an arithmetic number, because the mean of its divisors is an integer number (302881987275).

Almost surely, 2^{1211224304021} is an apocalyptic number.

It is an amenable number.

1211224304021 is a deficient number, since it is larger than the sum of its proper divisors (303645079).

1211224304021 is an equidigital number, since it uses as much as digits as its factorization.

1211224304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303645078.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1211224304021 its reverse (1204034221121), we get a palindrome (2415258525142).

The spelling of 1211224304021 in words is "one trillion, two hundred eleven billion, two hundred twenty-four million, three hundred four thousand, twenty-one".