1220421541 has 2 divisors, whose sum is σ = 1220421542. Its totient is φ = 1220421540.

The previous prime is 1220421533. The next prime is 1220421557. The reversal of 1220421541 is 1451240221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742780516 + 477641025 = 27254^2 + 21855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220421541 - 2³ = 1220421533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220451541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610210770 + 610210771.

It is an arithmetic number, because the mean of its divisors is an integer number (610210771).

Almost surely, 2^1220421541 is an apocalyptic number.

It is an amenable number.

1220421541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220421541 is an equidigital number, since it uses as much as digits as its factorization.

1220421541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1220421541 is about 34934.5322138425. The cubic root of 1220421541 is about 1068.6527840349.

Adding to 1220421541 its reverse (1451240221), we get a palindrome (2671661762).

The spelling of 1220421541 in words is "one billion, two hundred twenty million, four hundred twenty-one thousand, five hundred forty-one".