21411403220 has 24 divisors (see below), whose sum is σ = 45812325384. Its totient is φ = 8402965376.

The previous prime is 21411403217. The next prime is 21411403241. The reversal of 21411403220 is 2230411412.

It can be written as a sum of positive squares in 4 ways, for example, as 7928477764 + 13482925456 = 89042^2 + 116116^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21411403192 and 21411403201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10098659 + ... + 10100778.

It is an arithmetic number, because the mean of its divisors is an integer number (1908846891).

Almost surely, 2^21411403220 is an apocalyptic number.

21411403220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21411403220 is an abundant number, since it is smaller than the sum of its proper divisors (24400922164).

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

21411403220 is a wasteful number, since it uses less digits than its factorization.

21411403220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20199499 (or 20199497 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21411403220 its reverse (2230411412), we get a palindrome (23641814632).

The spelling of 21411403220 in words is "twenty-one billion, four hundred eleven million, four hundred three thousand, two hundred twenty".