2171250641 has 4 divisors (see below), whose sum is σ = 2481429312. Its totient is φ = 1861071972.

The previous prime is 2171250637. The next prime is 2171250661. The reversal of 2171250641 is 1460521712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2171250641 - 2² = 2171250637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2171250611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155089325 + ... + 155089338.

It is an arithmetic number, because the mean of its divisors is an integer number (620357328).

Almost surely, 2^2171250641 is an apocalyptic number.

It is an amenable number.

2171250641 is a deficient number, since it is larger than the sum of its proper divisors (310178671).

2171250641 is an equidigital number, since it uses as much as digits as its factorization.

2171250641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310178670.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 2171250641 is about 46596.6805792001. The cubic root of 2171250641 is about 1294.9012592981.

The spelling of 2171250641 in words is "two billion, one hundred seventy-one million, two hundred fifty thousand, six hundred forty-one".