1021100100221 has 4 divisors (see below), whose sum is σ = 1022036031744. Its totient is φ = 1020164168700.

The previous prime is 1021100100217. The next prime is 1021100100289. The reversal of 1021100100221 is 1220010011201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021100100221 - 2² = 1021100100217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021100100421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467964125 + ... + 467966306.

It is an arithmetic number, because the mean of its divisors is an integer number (255509007936).

Almost surely, 2^{1021100100221} is an apocalyptic number.

It is an amenable number.

1021100100221 is a deficient number, since it is larger than the sum of its proper divisors (935931523).

1021100100221 is an equidigital number, since it uses as much as digits as its factorization.

1021100100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935931522.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1021100100221 its reverse (1220010011201), we get a palindrome (2241110111422).

The spelling of 1021100100221 in words is "one trillion, twenty-one billion, one hundred million, one hundred thousand, two hundred twenty-one".