21110000111021 has 8 divisors (see below), whose sum is σ = 22438736675640. Its totient is φ = 19790927085568.

The previous prime is 21110000111003. The next prime is 21110000111023. The reversal of 21110000111021 is 12011100001112.

It can be written as a sum of positive squares in 4 ways, for example, as 18518270397796 + 2591729713225 = 4303286^2 + 1609885^2 .

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

It is not a de Polignac number, because 21110000111021 - 2²² = 21109995916717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110000110993 and 21110000111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110000111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2415880286 + ... + 2415889023.

It is an arithmetic number, because the mean of its divisors is an integer number (2804842084455).

Almost surely, 2^{21110000111021} is an apocalyptic number.

It is an amenable number.

21110000111021 is a deficient number, since it is larger than the sum of its proper divisors (1328736564619).

21110000111021 is a wasteful number, since it uses less digits than its factorization.

21110000111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4831769583.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21110000111021 its reverse (12011100001112), we get a palindrome (33121100112133).

The spelling of 21110000111021 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven thousand, twenty-one".