21210313220 has 24 divisors (see below), whose sum is σ = 45489354624. Its totient is φ = 8303611616.

The previous prime is 21210313199. The next prime is 21210313237. The reversal of 21210313220 is 2231301212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11281142 + ... + 11283021.

It is an arithmetic number, because the mean of its divisors is an integer number (1895389776).

Almost surely, 2^21210313220 is an apocalyptic number.

21210313220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210313220 is an abundant number, since it is smaller than the sum of its proper divisors (24279041404).

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

21210313220 is a wasteful number, since it uses less digits than its factorization.

21210313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22564219 (or 22564217 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21210313220 its reverse (2231301212), we get a palindrome (23441614432).

The spelling of 21210313220 in words is "twenty-one billion, two hundred ten million, three hundred thirteen thousand, two hundred twenty".