2421942291649 has 2 divisors, whose sum is σ = 2421942291650. Its totient is φ = 2421942291648.

The previous prime is 2421942291647. The next prime is 2421942291737. The reversal of 2421942291649 is 9461922491242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1375143202225 + 1046799089424 = 1172665^2 + 1023132^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421942291649 - 2¹ = 2421942291647 is a prime.

Together with 2421942291647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2421942291649.

It is not a weakly prime, because it can be changed into another prime (2421942291647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210971145824 + 1210971145825.

It is an arithmetic number, because the mean of its divisors is an integer number (1210971145825).

Almost surely, 2^{2421942291649} is an apocalyptic number.

It is an amenable number.

2421942291649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421942291649 is an equidigital number, since it uses as much as digits as its factorization.

2421942291649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 55.

The spelling of 2421942291649 in words is "two trillion, four hundred twenty-one billion, nine hundred forty-two million, two hundred ninety-one thousand, six hundred forty-nine".