21113341021 has 8 divisors (see below), whose sum is σ = 21245333760. Its totient is φ = 20981712528.

The previous prime is 21113341019. The next prime is 21113341037. The reversal of 21113341021 is 12014331112.

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

It is a cyclic number.

It is not a de Polignac number, because 21113341021 - 2¹ = 21113341019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113341021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113341061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25695 + ... + 207091.

It is an arithmetic number, because the mean of its divisors is an integer number (2655666720).

Almost surely, 2^21113341021 is an apocalyptic number.

It is an amenable number.

21113341021 is a deficient number, since it is larger than the sum of its proper divisors (131992739).

21113341021 is a wasteful number, since it uses less digits than its factorization.

21113341021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182123.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21113341021 its reverse (12014331112), we get a palindrome (33127672133).

Subtracting from 21113341021 its reverse (12014331112), we obtain a palindrome (9099009909).

The spelling of 21113341021 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-one thousand, twenty-one".