21120000110021 has 4 divisors (see below), whose sum is σ = 22231579063200. Its totient is φ = 20008421156844.

The previous prime is 21120000109997. The next prime is 21120000110039. The reversal of 21120000110021 is 12001100002112.

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 21120000110021 - 2¹⁴ = 21120000093637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21120000109984 and 21120000110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120000112021) 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, 555789476561 + ... + 555789476598.

It is an arithmetic number, because the mean of its divisors is an integer number (5557894765800).

Almost surely, 2^{21120000110021} is an apocalyptic number.

It is an amenable number.

21120000110021 is a deficient number, since it is larger than the sum of its proper divisors (1111578953179).

21120000110021 is a wasteful number, since it uses less digits than its factorization.

21120000110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111578953178.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21120000110021 its reverse (12001100002112), we get a palindrome (33121100112133).

The spelling of 21120000110021 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten thousand, twenty-one".