21220324412 has 24 divisors (see below), whose sum is σ = 42443743104. Its totient is φ = 9093761712.

The previous prime is 21220324403. The next prime is 21220324421. The reversal of 21220324412 is 21442302212.

It is an interprime number because it is at equal distance from previous prime (21220324403) and next prime (21220324421).

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, 693623 + ... + 723569.

It is an arithmetic number, because the mean of its divisors is an integer number (1768489296).

Almost surely, 2^21220324412 is an apocalyptic number.

It is an amenable number.

21220324412 is an abundant number, since it is smaller than the sum of its proper divisors (21223418692).

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

21220324412 is a wasteful number, since it uses less digits than its factorization.

21220324412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55265 (or 55263 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21220324412 its reverse (21442302212), we get a palindrome (42662626624).

The spelling of 21220324412 in words is "twenty-one billion, two hundred twenty million, three hundred twenty-four thousand, four hundred twelve".