2171421107 has 2 divisors, whose sum is σ = 2171421108. Its totient is φ = 2171421106.

The previous prime is 2171421089. The next prime is 2171421149. The reversal of 2171421107 is 7011241712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2171421107 - 2²⁰ = 2170372531 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171421907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085710553 + 1085710554.

It is an arithmetic number, because the mean of its divisors is an integer number (1085710554).

Almost surely, 2^2171421107 is an apocalyptic number.

2171421107 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171421107 is an equidigital number, since it uses as much as digits as its factorization.

2171421107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 2171421107 is about 46598.5097079295. The cubic root of 2171421107 is about 1294.9351461984.

Adding to 2171421107 its reverse (7011241712), we get a palindrome (9182662819).

The spelling of 2171421107 in words is "two billion, one hundred seventy-one million, four hundred twenty-one thousand, one hundred seven".