1821154460181 has 8 divisors (see below), whose sum is σ = 2775092510784. Its totient is φ = 1040659691520.

The previous prime is 1821154460129. The next prime is 1821154460243. The reversal of 1821154460181 is 1810644511281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1821154460181 - 2¹¹ = 1821154458133 is a prime.

It is a super-2 number, since 2×1821154460181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821154465181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43360820460 + ... + 43360820501.

It is an arithmetic number, because the mean of its divisors is an integer number (346886563848).

Almost surely, 2^{1821154460181} is an apocalyptic number.

It is an amenable number.

1821154460181 is a deficient number, since it is larger than the sum of its proper divisors (953938050603).

1821154460181 is an equidigital number, since it uses as much as digits as its factorization.

1821154460181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86721640971.

The product of its (nonzero) digits is 61440, while the sum is 42.

The spelling of 1821154460181 in words is "one trillion, eight hundred twenty-one billion, one hundred fifty-four million, four hundred sixty thousand, one hundred eighty-one".