1021000212221 has 16 divisors (see below), whose sum is σ = 1195492462848. Its totient is φ = 861616166400.

The previous prime is 1021000212163. The next prime is 1021000212223. The reversal of 1021000212221 is 1222120001201.

It is not a de Polignac number, because 1021000212221 - 2²⁶ = 1020933103357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021000212196 and 1021000212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000212223) 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, 37382885 + ... + 37410186.

It is an arithmetic number, because the mean of its divisors is an integer number (74718278928).

Almost surely, 2^{1021000212221} is an apocalyptic number.

1021000212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021000212221 is a deficient number, since it is larger than the sum of its proper divisors (174492250627).

1021000212221 is a wasteful number, since it uses less digits than its factorization.

1021000212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74793172.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1021000212221 its reverse (1222120001201), we get a palindrome (2243120213422).

The spelling of 1021000212221 in words is "one trillion, twenty-one billion, two hundred twelve thousand, two hundred twenty-one".