20021122001 has 2 divisors, whose sum is σ = 20021122002. Its totient is φ = 20021122000.

The previous prime is 20021121979. The next prime is 20021122013. The reversal of 20021122001 is 10022112002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15197958400 + 4823163601 = 123280^2 + 69449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021122001 - 2⁶ = 20021121937 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021122021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010561000 + 10010561001.

It is an arithmetic number, because the mean of its divisors is an integer number (10010561001).

Almost surely, 2^20021122001 is an apocalyptic number.

It is an amenable number.

20021122001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021122001 is an equidigital number, since it uses as much as digits as its factorization.

20021122001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021122001 its reverse (10022112002), we get a palindrome (30043234003).

Subtracting from 20021122001 its reverse (10022112002), we obtain a palindrome (9999009999).

The spelling of 20021122001 in words is "twenty billion, twenty-one million, one hundred twenty-two thousand, one".