221230311212 has 24 divisors (see below), whose sum is σ = 401387064960. Its totient is φ = 106579457280.

The previous prime is 221230311173. The next prime is 221230311233. The reversal of 221230311212 is 212113032122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3867053 + ... + 3923844.

It is an arithmetic number, because the mean of its divisors is an integer number (16724461040).

Almost surely, 2^221230311212 is an apocalyptic number.

It is an amenable number.

221230311212 is a deficient number, since it is larger than the sum of its proper divisors (180156753748).

221230311212 is a wasteful number, since it uses less digits than its factorization.

221230311212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7791161 (or 7791159 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221230311212 its reverse (212113032122), we get a palindrome (433343343334).

The spelling of 221230311212 in words is "two hundred twenty-one billion, two hundred thirty million, three hundred eleven thousand, two hundred twelve".