21120210000221 has 4 divisors (see below), whose sum is σ = 21120833950944. Its totient is φ = 21119586049500.

The previous prime is 21120210000157. The next prime is 21120210000251. The reversal of 21120210000221 is 12200001202112.

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 21120210000221 - 2⁶ = 21120210000157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120210000196 and 21120210000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120210000251) 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, 311924585 + ... + 311992286.

It is an arithmetic number, because the mean of its divisors is an integer number (5280208487736).

Almost surely, 2^{21120210000221} is an apocalyptic number.

It is an amenable number.

21120210000221 is a deficient number, since it is larger than the sum of its proper divisors (623950723).

21120210000221 is an equidigital number, since it uses as much as digits as its factorization.

21120210000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623950722.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120210000221 its reverse (12200001202112), we get a palindrome (33320211202333).

The spelling of 21120210000221 in words is "twenty-one trillion, one hundred twenty billion, two hundred ten million, two hundred twenty-one", and thus it is an aban number.