21200011032221 has 4 divisors (see below), whose sum is σ = 24228584036832. Its totient is φ = 18171438027612.

The previous prime is 21200011032199. The next prime is 21200011032223. The reversal of 21200011032221 is 12223011000212.

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 a de Polignac number, because none of the positive numbers 2^k-21200011032221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21200011032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200011032223) 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, 1514286502295 + ... + 1514286502308.

It is an arithmetic number, because the mean of its divisors is an integer number (6057146009208).

Almost surely, 2^{21200011032221} is an apocalyptic number.

It is an amenable number.

21200011032221 is a deficient number, since it is larger than the sum of its proper divisors (3028573004611).

21200011032221 is an equidigital number, since it uses as much as digits as its factorization.

21200011032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028573004610.

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

Adding to 21200011032221 its reverse (12223011000212), we get a palindrome (33423022032433).

The spelling of 21200011032221 in words is "twenty-one trillion, two hundred billion, eleven million, thirty-two thousand, two hundred twenty-one".