1002202001021 has 4 divisors (see below), whose sum is σ = 1079294462652. Its totient is φ = 925109539392.

The previous prime is 1002202000999. The next prime is 1002202001051. The reversal of 1002202001021 is 1201002022001.

It is a happy number.

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 567439797796 + 434762203225 = 753286^2 + 659365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002202001021 - 2⁶ = 1002202000957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002202000993 and 1002202001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002202001051) 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, 38546230796 + ... + 38546230821.

It is an arithmetic number, because the mean of its divisors is an integer number (269823615663).

Almost surely, 2^{1002202001021} is an apocalyptic number.

It is an amenable number.

1002202001021 is a deficient number, since it is larger than the sum of its proper divisors (77092461631).

1002202001021 is an equidigital number, since it uses as much as digits as its factorization.

1002202001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77092461630.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1002202001021 its reverse (1201002022001), we get a palindrome (2203204023022).

The spelling of 1002202001021 in words is "one trillion, two billion, two hundred two million, one thousand, twenty-one".