1856836234021 has 4 divisors (see below), whose sum is σ = 1856839900032. Its totient is φ = 1856832568012.

The previous prime is 1856836234013. The next prime is 1856836234027. The reversal of 1856836234021 is 1204326386581.

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 1856836234021 - 2³ = 1856836234013 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 (1856836234027) 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, 922495 + ... + 2136508.

It is an arithmetic number, because the mean of its divisors is an integer number (464209975008).

Almost surely, 2^{1856836234021} is an apocalyptic number.

It is an amenable number.

1856836234021 is a deficient number, since it is larger than the sum of its proper divisors (3666011).

1856836234021 is an equidigital number, since it uses as much as digits as its factorization.

1856836234021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666010.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 1856836234021 in words is "one trillion, eight hundred fifty-six billion, eight hundred thirty-six million, two hundred thirty-four thousand, twenty-one".