220402121 has 2 divisors, whose sum is σ = 220402122. Its totient is φ = 220402120.

The previous prime is 220402103. The next prime is 220402151. The reversal of 220402121 is 121204022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204490000 + 15912121 = 14300^2 + 3989^2 .

It is a cyclic number.

It is not a de Polignac number, because 220402121 - 2¹⁸ = 220139977 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 220402096 and 220402105.

It is not a weakly prime, because it can be changed into another prime (220402151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110201060 + 110201061.

It is an arithmetic number, because the mean of its divisors is an integer number (110201061).

Almost surely, 2^220402121 is an apocalyptic number.

It is an amenable number.

220402121 is a deficient number, since it is larger than the sum of its proper divisors (1).

220402121 is an equidigital number, since it uses as much as digits as its factorization.

220402121 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 220402121 is about 14845.9462817296. The cubic root of 220402121 is about 604.0486571404.

Adding to 220402121 its reverse (121204022), we get a palindrome (341606143).

The spelling of 220402121 in words is "two hundred twenty million, four hundred two thousand, one hundred twenty-one".