221212312300 has 72 divisors (see below), whose sum is σ = 548783375616. Its totient is φ = 75819773760.

The previous prime is 221212312261. The next prime is 221212312313. The reversal of 221212312300 is 3213212122.

It is a super-2 number, since 2×221212312300² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2192769 + ... + 2291431.

It is an arithmetic number, because the mean of its divisors is an integer number (7621991328).

Almost surely, 2^221212312300 is an apocalyptic number.

221212312300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212312300 is an abundant number, since it is smaller than the sum of its proper divisors (327571063316).

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

221212312300 is a wasteful number, since it uses less digits than its factorization.

221212312300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101887 (or 101880 counting only the distinct ones).

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

Adding to 221212312300 its reverse (3213212122), we get a palindrome (224425524422).

The spelling of 221212312300 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred twelve thousand, three hundred".