1220421104401 has 16 divisors (see below), whose sum is σ = 1258345866960. Its totient is φ = 1182758353920.

The previous prime is 1220421104363. The next prime is 1220421104437. The reversal of 1220421104401 is 1044011240221.

It can be written as a sum of positive squares in 8 ways, for example, as 1207632001 + 1219213472400 = 34751^2 + 1104180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220421104401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220421105401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56134005 + ... + 56155741.

It is an arithmetic number, because the mean of its divisors is an integer number (78646616685).

Almost surely, 2^{1220421104401} is an apocalyptic number.

It is an amenable number.

1220421104401 is a deficient number, since it is larger than the sum of its proper divisors (37924762559).

1220421104401 is a wasteful number, since it uses less digits than its factorization.

1220421104401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27684.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 1220421104401 its reverse (1044011240221), we get a palindrome (2264432344622).

The spelling of 1220421104401 in words is "one trillion, two hundred twenty billion, four hundred twenty-one million, one hundred four thousand, four hundred one".