1221212231012 has 48 divisors (see below), whose sum is σ = 2260802174400. Its totient is φ = 575590095360.

The previous prime is 1221212230961. The next prime is 1221212231027. The reversal of 1221212231012 is 2101322121221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105334688 + ... + 105346280.

It is an arithmetic number, because the mean of its divisors is an integer number (47100045300).

Almost surely, 2^{1221212231012} is an apocalyptic number.

It is an amenable number.

1221212231012 is a deficient number, since it is larger than the sum of its proper divisors (1039589943388).

1221212231012 is a wasteful number, since it uses less digits than its factorization.

1221212231012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18396 (or 18394 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221212231012 its reverse (2101322121221), we get a palindrome (3322534352233).

The spelling of 1221212231012 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred thirty-one thousand, twelve".