2851400821 has 4 divisors (see below), whose sum is σ = 2917712512. Its totient is φ = 2785089132.

The previous prime is 2851400789. The next prime is 2851400857. The reversal of 2851400821 is 1280041582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2851400821 - 2⁵ = 2851400789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2851400621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33155781 + ... + 33155866.

It is an arithmetic number, because the mean of its divisors is an integer number (729428128).

Almost surely, 2^2851400821 is an apocalyptic number.

It is an amenable number.

2851400821 is a deficient number, since it is larger than the sum of its proper divisors (66311691).

2851400821 is an equidigital number, since it uses as much as digits as its factorization.

2851400821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66311690.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 2851400821 is about 53398.5095391248. The cubic root of 2851400821 is about 1418.0321914878.

The spelling of 2851400821 in words is "two billion, eight hundred fifty-one million, four hundred thousand, eight hundred twenty-one".