20021244101 has 2 divisors, whose sum is σ = 20021244102. Its totient is φ = 20021244100.

The previous prime is 20021244071. The next prime is 20021244121. The reversal of 20021244101 is 10144212002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19663050625 + 358193476 = 140225^2 + 18926^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021244101 - 2¹⁴ = 20021227717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021244101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021244121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010622050 + 10010622051.

It is an arithmetic number, because the mean of its divisors is an integer number (10010622051).

Almost surely, 2^20021244101 is an apocalyptic number.

It is an amenable number.

20021244101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021244101 is an equidigital number, since it uses as much as digits as its factorization.

20021244101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20021244101 its reverse (10144212002), we get a palindrome (30165456103).

The spelling of 20021244101 in words is "twenty billion, twenty-one million, two hundred forty-four thousand, one hundred one".