2022120021781 has 2 divisors, whose sum is σ = 2022120021782. Its totient is φ = 2022120021780.

The previous prime is 2022120021769. The next prime is 2022120021793. The reversal of 2022120021781 is 1871200212202.

It is a balanced prime because it is at equal distance from previous prime (2022120021769) and next prime (2022120021793).

It can be written as a sum of positive squares in only one way, i.e., 1342469822500 + 679650199281 = 1158650^2 + 824409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2022120021781 - 2¹⁵ = 2022119989013 is a prime.

It is a super-2 number, since 2×2022120021781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2022120421781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1011060010890 + 1011060010891.

It is an arithmetic number, because the mean of its divisors is an integer number (1011060010891).

Almost surely, 2^{2022120021781} is an apocalyptic number.

It is an amenable number.

2022120021781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2022120021781 is an equidigital number, since it uses as much as digits as its factorization.

2022120021781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 28.

Adding to 2022120021781 its reverse (1871200212202), we get a palindrome (3893320233983).

The spelling of 2022120021781 in words is "two trillion, twenty-two billion, one hundred twenty million, twenty-one thousand, seven hundred eighty-one".