1850020421 has 2 divisors, whose sum is σ = 1850020422. Its totient is φ = 1850020420.

The previous prime is 1850020363. The next prime is 1850020429. The reversal of 1850020421 is 1240200581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1591132321 + 258888100 = 39889^2 + 16090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1850020421 - 2¹⁰ = 1850019397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1850020429) 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, 925010210 + 925010211.

It is an arithmetic number, because the mean of its divisors is an integer number (925010211).

Almost surely, 2^1850020421 is an apocalyptic number.

It is an amenable number.

1850020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1850020421 is an equidigital number, since it uses as much as digits as its factorization.

1850020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 1850020421 is about 43011.8637238611. The cubic root of 1850020421 is about 1227.6055430837.

The spelling of 1850020421 in words is "one billion, eight hundred fifty million, twenty thousand, four hundred twenty-one".