221312303300 has 54 divisors (see below), whose sum is σ = 527875597914. Its totient is φ = 80477196800.

The previous prime is 221312303287. The next prime is 221312303321. The reversal of 221312303300 is 3303213122.

It can be written as a sum of positive squares in 3 ways, for example, as 40858962496 + 180453340804 = 202136^2 + 424798^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9133037 + ... + 9157236.

Almost surely, 2^221312303300 is an apocalyptic number.

221312303300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221312303300 is an abundant number, since it is smaller than the sum of its proper divisors (306563294614).

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

221312303300 is a wasteful number, since it uses less digits than its factorization.

221312303300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18290309 (or 18290291 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 221312303300 its reverse (3303213122), we get a palindrome (224615516422).

The spelling of 221312303300 in words is "two hundred twenty-one billion, three hundred twelve million, three hundred three thousand, three hundred".