1001221110021 has 16 divisors (see below), whose sum is σ = 1541987592768. Its totient is φ = 571106515200.

The previous prime is 1001221109989. The next prime is 1001221110049. The reversal of 1001221110021 is 1200111221001.

It is not a de Polignac number, because 1001221110021 - 2⁵ = 1001221109989 is a prime.

It is a super-2 number, since 2×1001221110021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1001221109979 and 1001221110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001221110061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892353370 + ... + 892354491.

It is an arithmetic number, because the mean of its divisors is an integer number (96374224548).

Almost surely, 2^{1001221110021} is an apocalyptic number.

1001221110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001221110021 is a deficient number, since it is larger than the sum of its proper divisors (540766482747).

1001221110021 is a wasteful number, since it uses less digits than its factorization.

1001221110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784707892.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001221110021 its reverse (1200111221001), we get a palindrome (2201332331022).

The spelling of 1001221110021 in words is "one trillion, one billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".