2169021871 has 2 divisors, whose sum is σ = 2169021872. Its totient is φ = 2169021870.

The previous prime is 2169021863. The next prime is 2169021901. The reversal of 2169021871 is 1781209612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2169021871 - 2³ = 2169021863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2169021871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2169022871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084510935 + 1084510936.

It is an arithmetic number, because the mean of its divisors is an integer number (1084510936).

Almost surely, 2^2169021871 is an apocalyptic number.

2169021871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2169021871 is an equidigital number, since it uses as much as digits as its factorization.

2169021871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 2169021871 is about 46572.7588940144. The cubic root of 2169021871 is about 1294.4580392961.

The spelling of 2169021871 in words is "two billion, one hundred sixty-nine million, twenty-one thousand, eight hundred seventy-one".