2861143821 has 12 divisors (see below), whose sum is σ = 4134500448. Its totient is φ = 1906627464.

The previous prime is 2861143777. The next prime is 2861143849. The reversal of 2861143821 is 1283411682.

2861143821 is a `hidden beast` number, since 2 + 8 + 611 + 4 + 38 + 2 + 1 = 666.

It is not a de Polignac number, because 2861143821 - 2¹⁸ = 2860881677 is a prime.

It is a super-2 number, since 2×2861143821² = 16372287928892960082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861143321) 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, 43795 + ... + 87408.

It is an arithmetic number, because the mean of its divisors is an integer number (344541704).

Almost surely, 2^2861143821 is an apocalyptic number.

It is an amenable number.

2861143821 is a deficient number, since it is larger than the sum of its proper divisors (1273356627).

2861143821 is a wasteful number, since it uses less digits than its factorization.

2861143821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133632 (or 133629 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 2861143821 is about 53489.6608794634. The cubic root of 2861143821 is about 1419.6454548623.

The spelling of 2861143821 in words is "two billion, eight hundred sixty-one million, one hundred forty-three thousand, eight hundred twenty-one".