21122110221 has 8 divisors (see below), whose sum is σ = 28351826400. Its totient is φ = 13986900432.

The previous prime is 21122110199. The next prime is 21122110277. The reversal of 21122110221 is 12201122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21122110221 - 2⁵ = 21122110189 is a prime.

It is a super-2 number, since 2×21122110221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122110291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23626075 + ... + 23626968.

It is an arithmetic number, because the mean of its divisors is an integer number (3543978300).

Almost surely, 2^21122110221 is an apocalyptic number.

It is an amenable number.

21122110221 is a deficient number, since it is larger than the sum of its proper divisors (7229716179).

21122110221 is a wasteful number, since it uses less digits than its factorization.

21122110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47253195.

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

Adding to 21122110221 its reverse (12201122112), we get a palindrome (33323232333).

The spelling of 21122110221 in words is "twenty-one billion, one hundred twenty-two million, one hundred ten thousand, two hundred twenty-one".