21022112077 has 2 divisors, whose sum is σ = 21022112078. Its totient is φ = 21022112076.

The previous prime is 21022112051. The next prime is 21022112101. The reversal of 21022112077 is 77021122012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11365905321 + 9656206756 = 106611^2 + 98266^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022112077 - 2⁷ = 21022111949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022112477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511056038 + 10511056039.

It is an arithmetic number, because the mean of its divisors is an integer number (10511056039).

Almost surely, 2^21022112077 is an apocalyptic number.

It is an amenable number.

21022112077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022112077 is an equidigital number, since it uses as much as digits as its factorization.

21022112077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 25.

Adding to 21022112077 its reverse (77021122012), we get a palindrome (98043234089).

The spelling of 21022112077 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, seventy-seven".