2942721643 has 2 divisors, whose sum is σ = 2942721644. Its totient is φ = 2942721642.

The previous prime is 2942721631. The next prime is 2942721647. The reversal of 2942721643 is 3461272492.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2942721643 is a prime.

It is a super-2 number, since 2×2942721643² = 17319221336361238898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2942721596 and 2942721605.

It is not a weakly prime, because it can be changed into another prime (2942721647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1471360821 + 1471360822.

It is an arithmetic number, because the mean of its divisors is an integer number (1471360822).

Almost surely, 2^2942721643 is an apocalyptic number.

2942721643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2942721643 is an equidigital number, since it uses as much as digits as its factorization.

2942721643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 2942721643 is about 54246.8583698632. The cubic root of 2942721643 is about 1433.0116720720.

The spelling of 2942721643 in words is "two billion, nine hundred forty-two million, seven hundred twenty-one thousand, six hundred forty-three".