1221220102012 has 24 divisors (see below), whose sum is σ = 2143060536960. Its totient is φ = 608917523760.

The previous prime is 1221220102007. The next prime is 1221220102031. The reversal of 1221220102012 is 2102010221221.

It is a happy number.

It is a congruent number.

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, 12210087 + ... + 12309697.

It is an arithmetic number, because the mean of its divisors is an integer number (89294189040).

Almost surely, 2^{1221220102012} is an apocalyptic number.

It is an amenable number.

1221220102012 is a deficient number, since it is larger than the sum of its proper divisors (921840434948).

1221220102012 is a wasteful number, since it uses less digits than its factorization.

1221220102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108081 (or 108079 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221220102012 its reverse (2102010221221), we get a palindrome (3323230323233).

The spelling of 1221220102012 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred two thousand, twelve".