20221021001 has 2 divisors, whose sum is σ = 20221021002. Its totient is φ = 20221021000.

The previous prime is 20221020977. The next prime is 20221021027. The reversal of 20221021001 is 10012012202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16718748601 + 3502272400 = 129301^2 + 59180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221021001 - 2²² = 20216826697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20221021061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110510500 + 10110510501.

It is an arithmetic number, because the mean of its divisors is an integer number (10110510501).

Almost surely, 2^20221021001 is an apocalyptic number.

It is an amenable number.

20221021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221021001 is an equidigital number, since it uses as much as digits as its factorization.

20221021001 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20221021001 its reverse (10012012202), we get a palindrome (30233033203).

The spelling of 20221021001 in words is "twenty billion, two hundred twenty-one million, twenty-one thousand, one".