21102814277 has 2 divisors, whose sum is σ = 21102814278. Its totient is φ = 21102814276.

The previous prime is 21102814273. The next prime is 21102814333. The reversal of 21102814277 is 77241820112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11263364641 + 9839449636 = 106129^2 + 99194^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102814277 - 2² = 21102814273 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102814273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551407138 + 10551407139.

It is an arithmetic number, because the mean of its divisors is an integer number (10551407139).

Almost surely, 2^21102814277 is an apocalyptic number.

It is an amenable number.

21102814277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102814277 is an equidigital number, since it uses as much as digits as its factorization.

21102814277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The spelling of 21102814277 in words is "twenty-one billion, one hundred two million, eight hundred fourteen thousand, two hundred seventy-seven".