21120200011221 has 4 divisors (see below), whose sum is σ = 28160266681632. Its totient is φ = 14080133340812.

The previous prime is 21120200011201. The next prime is 21120200011259. The reversal of 21120200011221 is 12211000202112.

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 21120200011221 - 2⁵ = 21120200011189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120200011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120200011201) 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, 3520033335201 + ... + 3520033335206.

It is an arithmetic number, because the mean of its divisors is an integer number (7040066670408).

Almost surely, 2^{21120200011221} is an apocalyptic number.

It is an amenable number.

21120200011221 is a deficient number, since it is larger than the sum of its proper divisors (7040066670411).

21120200011221 is an equidigital number, since it uses as much as digits as its factorization.

21120200011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040066670410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120200011221 its reverse (12211000202112), we get a palindrome (33331200213333).

The spelling of 21120200011221 in words is "twenty-one trillion, one hundred twenty billion, two hundred million, eleven thousand, two hundred twenty-one".