221220311320 has 32 divisors (see below), whose sum is σ = 523942844400. Its totient is φ = 83830854528.

The previous prime is 221220311311. The next prime is 221220311353. The reversal of 221220311320 is 23113022122.

It is a super-2 number, since 2×221220311320² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145538919 + ... + 145540438.

Almost surely, 2^221220311320 is an apocalyptic number.

221220311320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220311320 is an abundant number, since it is smaller than the sum of its proper divisors (302722533080).

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

221220311320 is a wasteful number, since it uses less digits than its factorization.

221220311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291079387 (or 291079383 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221220311320 its reverse (23113022122), we get a palindrome (244333333442).

The spelling of 221220311320 in words is "two hundred twenty-one billion, two hundred twenty million, three hundred eleven thousand, three hundred twenty".