21021112302221 has 4 divisors (see below), whose sum is σ = 21021345879744. Its totient is φ = 21020878724700.

The previous prime is 21021112302131. The next prime is 21021112302241. The reversal of 21021112302221 is 12220321112012.

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 21021112302221 - 2¹⁰ = 21021112301197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021112302193 and 21021112302202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021112302241) 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, 116653715 + ... + 116833776.

It is an arithmetic number, because the mean of its divisors is an integer number (5255336469936).

Almost surely, 2^{21021112302221} is an apocalyptic number.

It is an amenable number.

21021112302221 is a deficient number, since it is larger than the sum of its proper divisors (233577523).

21021112302221 is an equidigital number, since it uses as much as digits as its factorization.

21021112302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233577522.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21021112302221 its reverse (12220321112012), we get a palindrome (33241433414233).

The spelling of 21021112302221 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, three hundred two thousand, two hundred twenty-one".