221311021320 has 48 divisors (see below), whose sum is σ = 719260820460. Its totient is φ = 59016272256.

The previous prime is 221311021297. The next prime is 221311021357. The reversal of 221311021320 is 23120113122.

221311021320 is a `hidden beast` number, since 2 + 213 + 110 + 21 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 188323017444 + 32988003876 = 433962^2 + 181626^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221311021293 and 221311021302.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307376059 + ... + 307376778.

Almost surely, 2^221311021320 is an apocalyptic number.

221311021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221311021320 is an abundant number, since it is smaller than the sum of its proper divisors (497949799140).

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

221311021320 is a wasteful number, since it uses less digits than its factorization.

221311021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614752854 (or 614752847 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221311021320 its reverse (23120113122), we get a palindrome (244431134442).

The spelling of 221311021320 in words is "two hundred twenty-one billion, three hundred eleven million, twenty-one thousand, three hundred twenty".