2175420261 has 32 divisors (see below), whose sum is σ = 3360098560. Its totient is φ = 1226244096.

The previous prime is 2175420193. The next prime is 2175420277. The reversal of 2175420261 is 1620245712.

It is not a de Polignac number, because 2175420261 - 2⁹ = 2175419749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2175420281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 684885 + ... + 688053.

It is an arithmetic number, because the mean of its divisors is an integer number (105003080).

Almost surely, 2^2175420261 is an apocalyptic number.

2175420261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2175420261 is a deficient number, since it is larger than the sum of its proper divisors (1184678299).

2175420261 is a wasteful number, since it uses less digits than its factorization.

2175420261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 2175420261 is about 46641.4007186748. The cubic root of 2175420261 is about 1295.7296288367.

Adding to 2175420261 its reverse (1620245712), we get a palindrome (3795665973).

The spelling of 2175420261 in words is "two billion, one hundred seventy-five million, four hundred twenty thousand, two hundred sixty-one".