1021002221101 has 4 divisors (see below), whose sum is σ = 1023360194332. Its totient is φ = 1018644247872.

The previous prime is 1021002221059. The next prime is 1021002221119. The reversal of 1021002221101 is 1011222001201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 393819002500 + 627183218601 = 627550^2 + 791949^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021002221101 - 2¹⁵ = 1021002188333 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 (1021002621101) 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, 1178985966 + ... + 1178986831.

It is an arithmetic number, because the mean of its divisors is an integer number (255840048583).

Almost surely, 2^{1021002221101} is an apocalyptic number.

It is an amenable number.

1021002221101 is a deficient number, since it is larger than the sum of its proper divisors (2357973231).

1021002221101 is an equidigital number, since it uses as much as digits as its factorization.

1021002221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357973230.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021002221101 its reverse (1011222001201), we get a palindrome (2032224222302).

The spelling of 1021002221101 in words is "one trillion, twenty-one billion, two million, two hundred twenty-one thousand, one hundred one".