21110011021 has 12 divisors (see below), whose sum is σ = 23224979232. Its totient is φ = 19173209000.

The previous prime is 21110010983. The next prime is 21110011049. The reversal of 21110011021 is 12011001112.

It is not a de Polignac number, because 21110011021 - 2⁷ = 21110010893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110010989 and 21110011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110011051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52056 + ... + 211966.

It is an arithmetic number, because the mean of its divisors is an integer number (1935414936).

Almost surely, 2^21110011021 is an apocalyptic number.

It is an amenable number.

21110011021 is a deficient number, since it is larger than the sum of its proper divisors (2114968211).

21110011021 is a wasteful number, since it uses less digits than its factorization.

21110011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161024 (or 161013 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21110011021 its reverse (12011001112), we get a palindrome (33121012133).

Subtracting from 21110011021 its reverse (12011001112), we obtain a palindrome (9099009909).

The spelling of 21110011021 in words is "twenty-one billion, one hundred ten million, eleven thousand, twenty-one".