21877340227 has 2 divisors, whose sum is σ = 21877340228. Its totient is φ = 21877340226.

The previous prime is 21877340209. The next prime is 21877340231. The reversal of 21877340227 is 72204377812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21877340227 - 2¹¹ = 21877338179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21877340257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10938670113 + 10938670114.

It is an arithmetic number, because the mean of its divisors is an integer number (10938670114).

Almost surely, 2^21877340227 is an apocalyptic number.

21877340227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21877340227 is an equidigital number, since it uses as much as digits as its factorization.

21877340227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 263424, while the sum is 43.

The spelling of 21877340227 in words is "twenty-one billion, eight hundred seventy-seven million, three hundred forty thousand, two hundred twenty-seven".