2170440521 has 2 divisors, whose sum is σ = 2170440522. Its totient is φ = 2170440520.

The previous prime is 2170440511. The next prime is 2170440539. The reversal of 2170440521 is 1250440712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2145079225 + 25361296 = 46315^2 + 5036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2170440521 is a prime.

It is not a weakly prime, because it can be changed into another prime (2170440511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085220260 + 1085220261.

It is an arithmetic number, because the mean of its divisors is an integer number (1085220261).

Almost surely, 2^2170440521 is an apocalyptic number.

It is an amenable number.

2170440521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170440521 is an equidigital number, since it uses as much as digits as its factorization.

2170440521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 2170440521 is about 46587.9868743005. The cubic root of 2170440521 is about 1294.7401914657.

The spelling of 2170440521 in words is "two billion, one hundred seventy million, four hundred forty thousand, five hundred twenty-one".