21043114420 has 48 divisors (see below), whose sum is σ = 46812321360. Its totient is φ = 7918331904.

The previous prime is 21043114397. The next prime is 21043114427. The reversal of 21043114420 is 2441134012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2706704676 + 18336409744 = 52026^2 + 135412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21043114391 and 21043114400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043114427) 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, 757822 + ... + 785098.

It is an arithmetic number, because the mean of its divisors is an integer number (975256695).

Almost surely, 2^21043114420 is an apocalyptic number.

21043114420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21043114420 is an abundant number, since it is smaller than the sum of its proper divisors (25769206940).

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

21043114420 is a wasteful number, since it uses less digits than its factorization.

21043114420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29572 (or 29570 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21043114420 its reverse (2441134012), we get a palindrome (23484248432).

The spelling of 21043114420 in words is "twenty-one billion, forty-three million, one hundred fourteen thousand, four hundred twenty".