1002021102121 has 4 divisors (see below), whose sum is σ = 1079099648452. Its totient is φ = 924942555792.

The previous prime is 1002021102077. The next prime is 1002021102127. The reversal of 1002021102121 is 1212011202001.

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 536132948521 + 465888153600 = 732211^2 + 682560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002021102121 - 2¹³ = 1002021093929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 77078546317 = 1002021102121 / (1 + 0 + 0 + 2 + 0 + 2 + 1 + 1 + 0 + 2 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002021102127) 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, 38539273146 + ... + 38539273171.

It is an arithmetic number, because the mean of its divisors is an integer number (269774912113).

Almost surely, 2^{1002021102121} is an apocalyptic number.

It is an amenable number.

1002021102121 is a deficient number, since it is larger than the sum of its proper divisors (77078546331).

1002021102121 is an equidigital number, since it uses as much as digits as its factorization.

1002021102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77078546330.

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

Adding to 1002021102121 its reverse (1212011202001), we get a palindrome (2214032304122).

The spelling of 1002021102121 in words is "one trillion, two billion, twenty-one million, one hundred two thousand, one hundred twenty-one".