1220403442421 has 2 divisors, whose sum is σ = 1220403442422. Its totient is φ = 1220403442420.

The previous prime is 1220403442393. The next prime is 1220403442463. The reversal of 1220403442421 is 1242443040221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 772133021521 + 448270420900 = 878711^2 + 669530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220403442421 - 2¹⁴ = 1220403426037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220403142421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610201721210 + 610201721211.

It is an arithmetic number, because the mean of its divisors is an integer number (610201721211).

Almost surely, 2^{1220403442421} is an apocalyptic number.

It is an amenable number.

1220403442421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220403442421 is an equidigital number, since it uses as much as digits as its factorization.

1220403442421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 1220403442421 its reverse (1242443040221), we get a palindrome (2462846482642).

The spelling of 1220403442421 in words is "one trillion, two hundred twenty billion, four hundred three million, four hundred forty-two thousand, four hundred twenty-one".