854621021 has 4 divisors (see below), whose sum is σ = 854809500. Its totient is φ = 854432544.

The previous prime is 854621011. The next prime is 854621029. The reversal of 854621021 is 120126458.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 807355396 + 47265625 = 28414^2 + 6875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-854621021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (854621029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87266 + ... + 96563.

It is an arithmetic number, because the mean of its divisors is an integer number (213702375).

Almost surely, 2^854621021 is an apocalyptic number.

It is an amenable number.

854621021 is a deficient number, since it is larger than the sum of its proper divisors (188479).

854621021 is a wasteful number, since it uses less digits than its factorization.

854621021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188478.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 854621021 is about 29233.9019119925. The cubic root of 854621021 is about 948.9817422110.

Adding to 854621021 its reverse (120126458), we get a palindrome (974747479).

The spelling of 854621021 in words is "eight hundred fifty-four million, six hundred twenty-one thousand, twenty-one".