2121565841 has 2 divisors, whose sum is σ = 2121565842. Its totient is φ = 2121565840.

The previous prime is 2121565811. The next prime is 2121565871. The reversal of 2121565841 is 1485651212.

It is a balanced prime because it is at equal distance from previous prime (2121565811) and next prime (2121565871).

It can be written as a sum of positive squares in only one way, i.e., 2110483600 + 11082241 = 45940^2 + 3329^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121565841 - 2¹⁰ = 2121564817 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121565801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060782920 + 1060782921.

It is an arithmetic number, because the mean of its divisors is an integer number (1060782921).

Almost surely, 2^2121565841 is an apocalyptic number.

It is an amenable number.

2121565841 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121565841 is an equidigital number, since it uses as much as digits as its factorization.

2121565841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 35.

The square root of 2121565841 is about 46060.4585409221. The cubic root of 2121565841 is about 1284.9478580083.

The spelling of 2121565841 in words is "two billion, one hundred twenty-one million, five hundred sixty-five thousand, eight hundred forty-one".