21113120230221 has 4 divisors (see below), whose sum is σ = 28150826973632. Its totient is φ = 14075413486812.

The previous prime is 21113120230201. The next prime is 21113120230271. The reversal of 21113120230221 is 12203202131112.

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 not a de Polignac number, because 21113120230221 - 2⁶ = 21113120230157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113120230201) 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, 3518853371701 + ... + 3518853371706.

It is an arithmetic number, because the mean of its divisors is an integer number (7037706743408).

Almost surely, 2^{21113120230221} is an apocalyptic number.

It is an amenable number.

21113120230221 is a deficient number, since it is larger than the sum of its proper divisors (7037706743411).

21113120230221 is an equidigital number, since it uses as much as digits as its factorization.

21113120230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037706743410.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21113120230221 its reverse (12203202131112), we get a palindrome (33316322361333).

The spelling of 21113120230221 in words is "twenty-one trillion, one hundred thirteen billion, one hundred twenty million, two hundred thirty thousand, two hundred twenty-one".