21113341020 has 72 divisors (see below), whose sum is σ = 64127503440. Its totient is φ = 5622865920.

The previous prime is 21113341019. The next prime is 21113341037. The reversal of 21113341020 is 2014331112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21113340984 and 21113341002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62155 + ... + 214685.

It is an arithmetic number, because the mean of its divisors is an integer number (890659770).

Almost surely, 2^21113341020 is an apocalyptic number.

21113341020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113341020 is an abundant number, since it is smaller than the sum of its proper divisors (43014162420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113341020 is a wasteful number, since it uses less digits than its factorization.

21113341020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153315 (or 153310 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21113341020 its reverse (2014331112), we get a palindrome (23127672132).

The spelling of 21113341020 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-one thousand, twenty".