2171219929 has 2 divisors, whose sum is σ = 2171219930. Its totient is φ = 2171219928.

The previous prime is 2171219899. The next prime is 2171219933. The reversal of 2171219929 is 9299121712.

2171219929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1249976025 + 921243904 = 35355^2 + 30352^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171219929 - 2⁹ = 2171219417 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171219969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085609964 + 1085609965.

It is an arithmetic number, because the mean of its divisors is an integer number (1085609965).

Almost surely, 2^2171219929 is an apocalyptic number.

It is an amenable number.

2171219929 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171219929 is an equidigital number, since it uses as much as digits as its factorization.

2171219929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 2171219929 is about 46596.3510266630. The cubic root of 2171219929 is about 1294.8951538775.

The spelling of 2171219929 in words is "two billion, one hundred seventy-one million, two hundred nineteen thousand, nine hundred twenty-nine".