1622206021 has 2 divisors, whose sum is σ = 1622206022. Its totient is φ = 1622206020.

The previous prime is 1622206013. The next prime is 1622206039. The reversal of 1622206021 is 1206022261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1271992225 + 350213796 = 35665^2 + 18714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622206021 - 2³ = 1622206013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1622205983 and 1622206001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1622206051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811103010 + 811103011.

It is an arithmetic number, because the mean of its divisors is an integer number (811103011).

Almost surely, 2^1622206021 is an apocalyptic number.

It is an amenable number.

1622206021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622206021 is an equidigital number, since it uses as much as digits as its factorization.

1622206021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1622206021 is about 40276.6187880760. The cubic root of 1622206021 is about 1174.9931542682.

Adding to 1622206021 its reverse (1206022261), we get a palindrome (2828228282).

The spelling of 1622206021 in words is "one billion, six hundred twenty-two million, two hundred six thousand, twenty-one".