21112200021 has 16 divisors (see below), whose sum is σ = 31166995968. Its totient is φ = 12604297200.

The previous prime is 21112200019. The next prime is 21112200029. The reversal of 21112200021 is 12000221112.

It is not a de Polignac number, because 21112200021 - 2¹ = 21112200019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112200029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4772145 + ... + 4776566.

It is an arithmetic number, because the mean of its divisors is an integer number (1947937248).

Almost surely, 2^21112200021 is an apocalyptic number.

It is an amenable number.

21112200021 is a deficient number, since it is larger than the sum of its proper divisors (10054795947).

21112200021 is a wasteful number, since it uses less digits than its factorization.

21112200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9548792.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21112200021 its reverse (12000221112), we get a palindrome (33112421133).

The spelling of 21112200021 in words is "twenty-one billion, one hundred twelve million, two hundred thousand, twenty-one".