8121856941 has 24 divisors (see below), whose sum is σ = 12915508320. Its totient is φ = 4877172000.

The previous prime is 8121856927. The next prime is 8121856979. The reversal of 8121856941 is 1496581218.

It is a happy number.

8121856941 is a `hidden beast` number, since 81 + 2 + 1 + 8 + 569 + 4 + 1 = 666.

It is not a de Polignac number, because 8121856941 - 2⁶ = 8121856877 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121856241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 365535 + ... + 387116.

It is an arithmetic number, because the mean of its divisors is an integer number (538146180).

Almost surely, 2^8121856941 is an apocalyptic number.

It is an amenable number.

8121856941 is a deficient number, since it is larger than the sum of its proper divisors (4793651379).

8121856941 is a wasteful number, since it uses less digits than its factorization.

8121856941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752777 (or 752774 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 8121856941 is about 90121.3456457459. The cubic root of 8121856941 is about 2010.1036175884.

The spelling of 8121856941 in words is "eight billion, one hundred twenty-one million, eight hundred fifty-six thousand, nine hundred forty-one".