21031223020201 has 8 divisors (see below), whose sum is σ = 21135842708904. Its totient is φ = 20926746746880.

The previous prime is 21031223020169. The next prime is 21031223020207. The reversal of 21031223020201 is 10202032213012.

It can be written as a sum of positive squares in 4 ways, for example, as 843715731600 + 20187507288601 = 918540^2 + 4493051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21031223020201 - 2⁵ = 21031223020169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031223020207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35559820 + ... + 36146413.

It is an arithmetic number, because the mean of its divisors is an integer number (2641980338613).

Almost surely, 2^{21031223020201} is an apocalyptic number.

It is an amenable number.

21031223020201 is a deficient number, since it is larger than the sum of its proper divisors (104619688703).

21031223020201 is a wasteful number, since it uses less digits than its factorization.

21031223020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71707691.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21031223020201 its reverse (10202032213012), we get a palindrome (31233255233213).

The spelling of 21031223020201 in words is "twenty-one trillion, thirty-one billion, two hundred twenty-three million, twenty thousand, two hundred one".