21011002210277 has 2 divisors, whose sum is σ = 21011002210278. Its totient is φ = 21011002210276.

The previous prime is 21011002210271. The next prime is 21011002210321. The reversal of 21011002210277 is 77201220011012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11442429267556 + 9568572942721 = 3382666^2 + 3093311^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011002210277 - 2²⁰ = 21011001161701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011002210271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505501105138 + 10505501105139.

It is an arithmetic number, because the mean of its divisors is an integer number (10505501105139).

Almost surely, 2^{21011002210277} is an apocalyptic number.

It is an amenable number.

21011002210277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011002210277 is an equidigital number, since it uses as much as digits as its factorization.

21011002210277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 26.

Adding to 21011002210277 its reverse (77201220011012), we get a palindrome (98212222221289).

The spelling of 21011002210277 in words is "twenty-one trillion, eleven billion, two million, two hundred ten thousand, two hundred seventy-seven".