1220344221421 has 4 divisors (see below), whose sum is σ = 1314216853852. Its totient is φ = 1126471588992.

The previous prime is 1220344221403. The next prime is 1220344221479. The reversal of 1220344221421 is 1241224430221.

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 389393472196 + 830950749225 = 624014^2 + 911565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220344221421 - 2³¹ = 1218196737773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220344221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220344281421) 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, 46936316196 + ... + 46936316221.

It is an arithmetic number, because the mean of its divisors is an integer number (328554213463).

Almost surely, 2^{1220344221421} is an apocalyptic number.

It is an amenable number.

1220344221421 is a deficient number, since it is larger than the sum of its proper divisors (93872632431).

1220344221421 is an equidigital number, since it uses as much as digits as its factorization.

1220344221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93872632430.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 1220344221421 its reverse (1241224430221), we get a palindrome (2461568651642).

The spelling of 1220344221421 in words is "one trillion, two hundred twenty billion, three hundred forty-four million, two hundred twenty-one thousand, four hundred twenty-one".