1221002313212 has 12 divisors (see below), whose sum is σ = 2331004416216. Its totient is φ = 555001051440.

The previous prime is 1221002313173. The next prime is 1221002313233. The reversal of 1221002313212 is 2123132001221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13875026243 + ... + 13875026330.

It is an arithmetic number, because the mean of its divisors is an integer number (194250368018).

Almost surely, 2^{1221002313212} is an apocalyptic number.

It is an amenable number.

1221002313212 is a deficient number, since it is larger than the sum of its proper divisors (1110002103004).

1221002313212 is a wasteful number, since it uses less digits than its factorization.

1221002313212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27750052588 (or 27750052586 counting only the distinct ones).

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

Adding to 1221002313212 its reverse (2123132001221), we get a palindrome (3344134314433).

The spelling of 1221002313212 in words is "one trillion, two hundred twenty-one billion, two million, three hundred thirteen thousand, two hundred twelve".