21113212043 has 16 divisors (see below), whose sum is σ = 27467444736. Its totient is φ = 15736554240.

The previous prime is 21113212027. The next prime is 21113212079. The reversal of 21113212043 is 34021231112.

It is not a de Polignac number, because 21113212043 - 2⁴ = 21113212027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113212093) 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, 5959046 + ... + 5962587.

It is an arithmetic number, because the mean of its divisors is an integer number (1716715296).

Almost surely, 2^21113212043 is an apocalyptic number.

21113212043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21113212043 is a deficient number, since it is larger than the sum of its proper divisors (6354232693).

21113212043 is a wasteful number, since it uses less digits than its factorization.

21113212043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11921674.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21113212043 its reverse (34021231112), we get a palindrome (55134443155).

The spelling of 21113212043 in words is "twenty-one billion, one hundred thirteen million, two hundred twelve thousand, forty-three".