21148380277 has 2 divisors, whose sum is σ = 21148380278. Its totient is φ = 21148380276.

The previous prime is 21148380269. The next prime is 21148380311. The reversal of 21148380277 is 77208384112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15305153796 + 5843226481 = 123714^2 + 76441^2 .

It is a cyclic number.

It is not a de Polignac number, because 21148380277 - 2³ = 21148380269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21148380677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10574190138 + 10574190139.

It is an arithmetic number, because the mean of its divisors is an integer number (10574190139).

Almost surely, 2^21148380277 is an apocalyptic number.

It is an amenable number.

21148380277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21148380277 is an equidigital number, since it uses as much as digits as its factorization.

21148380277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 21148380277 in words is "twenty-one billion, one hundred forty-eight million, three hundred eighty thousand, two hundred seventy-seven".