21112011213 has 16 divisors (see below), whose sum is σ = 29560338816. Its totient is φ = 13376975040.

The previous prime is 21112011191. The next prime is 21112011287. The reversal of 21112011213 is 31211021112.

It is not a de Polignac number, because 21112011213 - 2⁵ = 21112011181 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21112011192 and 21112011201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112012213) 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, 963598 + ... + 985263.

It is an arithmetic number, because the mean of its divisors is an integer number (1847521176).

Almost surely, 2^21112011213 is an apocalyptic number.

21112011213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21112011213 is a deficient number, since it is larger than the sum of its proper divisors (8448327603).

21112011213 is a wasteful number, since it uses less digits than its factorization.

21112011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949044.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21112011213 its reverse (31211021112), we get a palindrome (52323032325).

The spelling of 21112011213 in words is "twenty-one billion, one hundred twelve million, eleven thousand, two hundred thirteen".