2842257721 has 2 divisors, whose sum is σ = 2842257722. Its totient is φ = 2842257720.

The previous prime is 2842257713. The next prime is 2842257739. The reversal of 2842257721 is 1277522482.

2842257721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2536532496 + 305725225 = 50364^2 + 17485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2842257721 - 2³ = 2842257713 is a prime.

It is a super-2 number, since 2×2842257721² = 16156857905168227682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2842257751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1421128860 + 1421128861.

It is an arithmetic number, because the mean of its divisors is an integer number (1421128861).

Almost surely, 2^2842257721 is an apocalyptic number.

It is an amenable number.

2842257721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2842257721 is an equidigital number, since it uses as much as digits as its factorization.

2842257721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 40.

The square root of 2842257721 is about 53312.8288594781. The cubic root of 2842257721 is about 1416.5149147224.

The spelling of 2842257721 in words is "two billion, eight hundred forty-two million, two hundred fifty-seven thousand, seven hundred twenty-one".