21121120010221 has 32 divisors (see below), whose sum is σ = 27401915059200. Its totient is φ = 15802808676480.

The previous prime is 21121120010153. The next prime is 21121120010231. The reversal of 21121120010221 is 12201002112112.

It is not a de Polignac number, because 21121120010221 - 2²⁷ = 21120985792493 is a prime.

It is a super-2 number, since 2×21121120010221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121120010195 and 21121120010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121120010231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53864616 + ... + 54255313.

It is an arithmetic number, because the mean of its divisors is an integer number (856309845600).

Almost surely, 2^{21121120010221} is an apocalyptic number.

It is an amenable number.

21121120010221 is a deficient number, since it is larger than the sum of its proper divisors (6280795048979).

21121120010221 is a wasteful number, since it uses less digits than its factorization.

21121120010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108120049.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121120010221 its reverse (12201002112112), we get a palindrome (33322122122333).

The spelling of 21121120010221 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, ten thousand, two hundred twenty-one".