1002210121021 has 4 divisors (see below), whose sum is σ = 1002311354044. Its totient is φ = 1002108888000.

The previous prime is 1002210121007. The next prime is 1002210121043. The reversal of 1002210121021 is 1201210122001.

1002210121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 618442260921 + 383767860100 = 786411^2 + 619490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002210121021 - 2¹³ = 1002210112829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002210120992 and 1002210121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002210121621) 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, 50601660 + ... + 50621461.

It is an arithmetic number, because the mean of its divisors is an integer number (250577838511).

Almost surely, 2^{1002210121021} is an apocalyptic number.

It is an amenable number.

1002210121021 is a deficient number, since it is larger than the sum of its proper divisors (101233023).

1002210121021 is an equidigital number, since it uses as much as digits as its factorization.

1002210121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101233022.

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

Adding to 1002210121021 its reverse (1201210122001), we get a palindrome (2203420243022).

The spelling of 1002210121021 in words is "one trillion, two billion, two hundred ten million, one hundred twenty-one thousand, twenty-one".