21230221100201 has 4 divisors (see below), whose sum is σ = 21234030583812. Its totient is φ = 21226411616592.

The previous prime is 21230221100183. The next prime is 21230221100203. The reversal of 21230221100201 is 10200112203212.

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 6420654277801 + 14809566822400 = 2533901^2 + 3848320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230221100201 is a prime.

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 21230221100201.

It is not an unprimeable number, because it can be changed into a prime (21230221100203) 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, 1904733446 + ... + 1904744591.

It is an arithmetic number, because the mean of its divisors is an integer number (5308507645953).

Almost surely, 2^{21230221100201} is an apocalyptic number.

It is an amenable number.

21230221100201 is a deficient number, since it is larger than the sum of its proper divisors (3809483611).

21230221100201 is an equidigital number, since it uses as much as digits as its factorization.

21230221100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3809483610.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21230221100201 its reverse (10200112203212), we get a palindrome (31430333303413).

It can be divided in two parts, 2123022 and 1100201, that added together give a palindrome (3223223).

The spelling of 21230221100201 in words is "twenty-one trillion, two hundred thirty billion, two hundred twenty-one million, one hundred thousand, two hundred one".