2171209975 has 12 divisors (see below), whose sum is σ = 2937055320. Its totient is φ = 1579061600.

The previous prime is 2171209969. The next prime is 2171210021. The reversal of 2171209975 is 5799021712.

It is not a de Polignac number, because 2171209975 - 2³ = 2171209967 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3947380 + ... + 3947929.

It is an arithmetic number, because the mean of its divisors is an integer number (244754610).

Almost surely, 2^2171209975 is an apocalyptic number.

2171209975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2171209975 is a deficient number, since it is larger than the sum of its proper divisors (765845345).

2171209975 is a wasteful number, since it uses less digits than its factorization.

2171209975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7895330 (or 7895325 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 2171209975 is about 46596.2442156018. The cubic root of 2171209975 is about 1294.8931750505.

The spelling of 2171209975 in words is "two billion, one hundred seventy-one million, two hundred nine thousand, nine hundred seventy-five".