21000221203231 has 8 divisors (see below), whose sum is σ = 21009110922800. Its totient is φ = 20991331932480.

The previous prime is 21000221203123. The next prime is 21000221203243. The reversal of 21000221203231 is 13230212200012.

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 21000221203231 - 2²⁵ = 21000187648799 is a prime.

It is a super-2 number, since 2×21000221203231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000221203199 and 21000221203208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000221203261) 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, 120590740 + ... + 120764758.

It is an arithmetic number, because the mean of its divisors is an integer number (2626138865350).

Almost surely, 2^{21000221203231} is an apocalyptic number.

21000221203231 is a deficient number, since it is larger than the sum of its proper divisors (8889719569).

21000221203231 is a wasteful number, since it uses less digits than its factorization.

21000221203231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224409.

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

Adding to 21000221203231 its reverse (13230212200012), we get a palindrome (34230433403243).

The spelling of 21000221203231 in words is "twenty-one trillion, two hundred twenty-one million, two hundred three thousand, two hundred thirty-one".