10002201021 has 6 divisors (see below), whose sum is σ = 14447623710. Its totient is φ = 6668134008.

The previous prime is 10002201019. The next prime is 10002201031. The reversal of 10002201021 is 12010220001.

It can be written as a sum of positive squares in only one way, i.e., 10002200121 + 900 = 100011^2 + 30^2 .

It is not a de Polignac number, because 10002201021 - 2¹ = 10002201019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1111355669 = 10002201021 / (1 + 0 + 0 + 0 + 2 + 2 + 0 + 1 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 10002200994 and 10002201012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10002201031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555677826 + ... + 555677843.

It is an arithmetic number, because the mean of its divisors is an integer number (2407937285).

Almost surely, 2^10002201021 is an apocalyptic number.

It is an amenable number.

10002201021 is a deficient number, since it is larger than the sum of its proper divisors (4445422689).

10002201021 is a wasteful number, since it uses less digits than its factorization.

10002201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111355675 (or 1111355672 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10002201021 its reverse (12010220001), we get a palindrome (22012421022).

The spelling of 10002201021 in words is "ten billion, two million, two hundred one thousand, twenty-one".