2642160821 has 2 divisors, whose sum is σ = 2642160822. Its totient is φ = 2642160820.

The previous prime is 2642160817. The next prime is 2642160923. The reversal of 2642160821 is 1280612462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1847710225 + 794450596 = 42985^2 + 28186^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642160821 - 2² = 2642160817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2642168821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321080410 + 1321080411.

It is an arithmetic number, because the mean of its divisors is an integer number (1321080411).

Almost surely, 2^2642160821 is an apocalyptic number.

It is an amenable number.

2642160821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2642160821 is an equidigital number, since it uses as much as digits as its factorization.

2642160821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 2642160821 is about 51401.9534745519. The cubic root of 2642160821 is about 1382.4616186165.

The spelling of 2642160821 in words is "two billion, six hundred forty-two million, one hundred sixty thousand, eight hundred twenty-one".