1001121110021 has 8 divisors (see below), whose sum is σ = 1002790676160. Its totient is φ = 999452348928.

The previous prime is 1001121109999. The next prime is 1001121110051. The reversal of 1001121110021 is 1200111211001.

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 1001121110021 - 2⁶ = 1001121109957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001121109984 and 1001121110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001121110051) 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, 2314070 + ... + 2712408.

It is an arithmetic number, because the mean of its divisors is an integer number (125348834520).

Almost surely, 2^{1001121110021} is an apocalyptic number.

It is an amenable number.

1001121110021 is a deficient number, since it is larger than the sum of its proper divisors (1669566139).

1001121110021 is an equidigital number, since it uses as much as digits as its factorization.

1001121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402523.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1001121110021 its reverse (1200111211001), we get a palindrome (2201232321022).

The spelling of 1001121110021 in words is "one trillion, one billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".