14128857221 has 2 divisors, whose sum is σ = 14128857222. Its totient is φ = 14128857220.

The previous prime is 14128857209. The next prime is 14128857227. The reversal of 14128857221 is 12275882141.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10401144196 + 3727713025 = 101986^2 + 61055^2 .

It is a cyclic number.

It is not a de Polignac number, because 14128857221 - 2²⁶ = 14061748357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14128857227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7064428610 + 7064428611.

It is an arithmetic number, because the mean of its divisors is an integer number (7064428611).

Almost surely, 2^14128857221 is an apocalyptic number.

It is an amenable number.

14128857221 is a deficient number, since it is larger than the sum of its proper divisors (1).

14128857221 is an equidigital number, since it uses as much as digits as its factorization.

14128857221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71680, while the sum is 41.

The spelling of 14128857221 in words is "fourteen billion, one hundred twenty-eight million, eight hundred fifty-seven thousand, two hundred twenty-one".