21112010211077 has 2 divisors, whose sum is σ = 21112010211078. Its totient is φ = 21112010211076.

The previous prime is 21112010211049. The next prime is 21112010211157. The reversal of 21112010211077 is 77011201021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11866433463361 + 9245576747716 = 3444769^2 + 3040654^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112010211077 - 2¹² = 21112010206981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112010210077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556005105538 + 10556005105539.

It is an arithmetic number, because the mean of its divisors is an integer number (10556005105539).

Almost surely, 2^{21112010211077} is an apocalyptic number.

It is an amenable number.

21112010211077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112010211077 is an equidigital number, since it uses as much as digits as its factorization.

21112010211077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 26.

Adding to 21112010211077 its reverse (77011201021112), we get a palindrome (98123211232189).

The spelling of 21112010211077 in words is "twenty-one trillion, one hundred twelve billion, ten million, two hundred eleven thousand, seventy-seven".