2042820421 has 2 divisors, whose sum is σ = 2042820422. Its totient is φ = 2042820420.

The previous prime is 2042820413. The next prime is 2042820457. The reversal of 2042820421 is 1240282402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2017267396 + 25553025 = 44914^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042820421 - 2³ = 2042820413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2042820401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021410210 + 1021410211.

It is an arithmetic number, because the mean of its divisors is an integer number (1021410211).

Almost surely, 2^2042820421 is an apocalyptic number.

It is an amenable number.

2042820421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042820421 is an equidigital number, since it uses as much as digits as its factorization.

2042820421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 2042820421 is about 45197.5709634932. The cubic root of 2042820421 is about 1268.8493558502.

The spelling of 2042820421 in words is "two billion, forty-two million, eight hundred twenty thousand, four hundred twenty-one".