21012022022077 has 2 divisors, whose sum is σ = 21012022022078. Its totient is φ = 21012022022076.

The previous prime is 21012022021979. The next prime is 21012022022087. The reversal of 21012022022077 is 77022022021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12799837114596 + 8212184907481 = 3577686^2 + 2865691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012022022077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012022022087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506011011038 + 10506011011039.

It is an arithmetic number, because the mean of its divisors is an integer number (10506011011039).

Almost surely, 2^{21012022022077} is an apocalyptic number.

It is an amenable number.

21012022022077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012022022077 is an equidigital number, since it uses as much as digits as its factorization.

21012022022077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 28.

Adding to 21012022022077 its reverse (77022022021012), we get a palindrome (98034044043089).

The spelling of 21012022022077 in words is "twenty-one trillion, twelve billion, twenty-two million, twenty-two thousand, seventy-seven".