2421735661 has 2 divisors, whose sum is σ = 2421735662. Its totient is φ = 2421735660.

The previous prime is 2421735559. The next prime is 2421735689. The reversal of 2421735661 is 1665371242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2333469636 + 88266025 = 48306^2 + 9395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2421735661 is a prime.

It is a super-2 number, since 2×2421735661² = 11729607223518213842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2421735661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421735061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210867830 + 1210867831.

It is an arithmetic number, because the mean of its divisors is an integer number (1210867831).

Almost surely, 2^2421735661 is an apocalyptic number.

It is an amenable number.

2421735661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421735661 is an equidigital number, since it uses as much as digits as its factorization.

2421735661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 37.

The square root of 2421735661 is about 49211.1335065552. The cubic root of 2421735661 is about 1342.8955839106.

The spelling of 2421735661 in words is "two billion, four hundred twenty-one million, seven hundred thirty-five thousand, six hundred sixty-one".