1220220401 has 2 divisors, whose sum is σ = 1220220402. Its totient is φ = 1220220400.

The previous prime is 1220220383. The next prime is 1220220409. The reversal of 1220220401 is 1040220221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 886610176 + 333610225 = 29776^2 + 18265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220220401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220220409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110200 + 610110201.

It is an arithmetic number, because the mean of its divisors is an integer number (610110201).

Almost surely, 2^1220220401 is an apocalyptic number.

It is an amenable number.

1220220401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220220401 is an equidigital number, since it uses as much as digits as its factorization.

1220220401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1220220401 is about 34931.6532818016. The cubic root of 1220220401 is about 1068.5940719086.

Adding to 1220220401 its reverse (1040220221), we get a palindrome (2260440622).

The spelling of 1220220401 in words is "one billion, two hundred twenty million, two hundred twenty thousand, four hundred one".