21002002232201 has 4 divisors (see below), whose sum is σ = 21014600915472. Its totient is φ = 20989403548932.

The previous prime is 21002002232191. The next prime is 21002002232243. The reversal of 21002002232201 is 10223220020012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21002002232201 - 2⁴² = 16603955721097 is a prime.

It is a super-2 number, since 2×21002002232201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002002232201.

It is not an unprimeable number, because it can be changed into a prime (21002002232401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6299339135 + ... + 6299342468.

It is an arithmetic number, because the mean of its divisors is an integer number (5253650228868).

Almost surely, 2^{21002002232201} is an apocalyptic number.

It is an amenable number.

21002002232201 is a deficient number, since it is larger than the sum of its proper divisors (12598683271).

21002002232201 is a wasteful number, since it uses less digits than its factorization.

21002002232201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12598683270.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21002002232201 its reverse (10223220020012), we get a palindrome (31225222252213).

The spelling of 21002002232201 in words is "twenty-one trillion, two billion, two million, two hundred thirty-two thousand, two hundred one".