1821021110011 has 8 divisors (see below), whose sum is σ = 1829693454848. Its totient is φ = 1812349161000.

The previous prime is 1821021109993. The next prime is 1821021110071. The reversal of 1821021110011 is 1100111201281.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1821021110011 - 2⁵ = 1821021109979 is a prime.

It is a super-2 number, since 2×1821021110011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821021110071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13663666 + ... + 13796296.

It is an arithmetic number, because the mean of its divisors is an integer number (228711681856).

Almost surely, 2^{1821021110011} is an apocalyptic number.

1821021110011 is a deficient number, since it is larger than the sum of its proper divisors (8672344837).

1821021110011 is a wasteful number, since it uses less digits than its factorization.

1821021110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197913.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 1821021110011 its reverse (1100111201281), we get a palindrome (2921132311292).

The spelling of 1821021110011 in words is "one trillion, eight hundred twenty-one billion, twenty-one million, one hundred ten thousand, eleven".