1021002102121 has 4 divisors (see below), whose sum is σ = 1021233050244. Its totient is φ = 1020771154000.

The previous prime is 1021002102091. The next prime is 1021002102139. The reversal of 1021002102121 is 1212012001201.

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 481724836096 + 539277266025 = 694064^2 + 734355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021002102121 - 2²³ = 1020993713513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021002102151) 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, 115467430 + ... + 115476271.

It is an arithmetic number, because the mean of its divisors is an integer number (255308262561).

Almost surely, 2^{1021002102121} is an apocalyptic number.

It is an amenable number.

1021002102121 is a deficient number, since it is larger than the sum of its proper divisors (230948123).

1021002102121 is an equidigital number, since it uses as much as digits as its factorization.

1021002102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230948122.

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

Adding to 1021002102121 its reverse (1212012001201), we get a palindrome (2233014103322).

The spelling of 1021002102121 in words is "one trillion, twenty-one billion, two million, one hundred two thousand, one hundred twenty-one".