2085450021 has 12 divisors (see below), whose sum is σ = 3039954060. Its totient is φ = 1377544320.

The previous prime is 2085450007. The next prime is 2085450067. The reversal of 2085450021 is 1200545802.

It is a happy number.

2085450021 is a `hidden beast` number, since 208 + 5 + 450 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1028484900 + 1056965121 = 32070^2 + 32511^2 .

It is not a de Polignac number, because 2085450021 - 2⁷ = 2085449893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2085450091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1061940 + ... + 1063901.

It is an arithmetic number, because the mean of its divisors is an integer number (253329505).

Almost surely, 2^2085450021 is an apocalyptic number.

It is an amenable number.

2085450021 is a deficient number, since it is larger than the sum of its proper divisors (954504039).

2085450021 is a wasteful number, since it uses less digits than its factorization.

2085450021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125956 (or 2125953 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 2085450021 is about 45666.7277238035. The cubic root of 2085450021 is about 1277.6147843089.

Adding to 2085450021 its reverse (1200545802), we get a palindrome (3285995823).

The spelling of 2085450021 in words is "two billion, eighty-five million, four hundred fifty thousand, twenty-one".