21213414220 has 12 divisors (see below), whose sum is σ = 44548169904. Its totient is φ = 8485365680.

The previous prime is 21213414217. The next prime is 21213414251. The reversal of 21213414220 is 2241431212.

It is a junction number, because it is equal to n+sod(n) for n = 21213414191 and 21213414200.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530335336 + ... + 530335375.

It is an arithmetic number, because the mean of its divisors is an integer number (3712347492).

Almost surely, 2^21213414220 is an apocalyptic number.

21213414220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213414220 is an abundant number, since it is smaller than the sum of its proper divisors (23334755684).

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

21213414220 is a wasteful number, since it uses less digits than its factorization.

21213414220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060670720 (or 1060670718 counting only the distinct ones).

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

Adding to 21213414220 its reverse (2241431212), we get a palindrome (23454845432).

The spelling of 21213414220 in words is "twenty-one billion, two hundred thirteen million, four hundred fourteen thousand, two hundred twenty".