220022021 has 2 divisors, whose sum is σ = 220022022. Its totient is φ = 220022020.

The previous prime is 220022009. The next prime is 220022051. The reversal of 220022021 is 120220022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181953121 + 38068900 = 13489^2 + 6170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220022021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220021993 and 220022011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220022051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110011010 + 110011011.

It is an arithmetic number, because the mean of its divisors is an integer number (110011011).

Almost surely, 2^220022021 is an apocalyptic number.

It is an amenable number.

220022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220022021 is an equidigital number, since it uses as much as digits as its factorization.

220022021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 220022021 is about 14833.1392833749. The cubic root of 220022021 is about 603.7012149183.

Adding to 220022021 its reverse (120220022), we get a palindrome (340242043).

The spelling of 220022021 in words is "two hundred twenty million, twenty-two thousand, twenty-one".