1221211201012 has 48 divisors (see below), whose sum is σ = 2383817752512. Its totient is φ = 542754247680.

The previous prime is 1221211200977. The next prime is 1221211201013. The reversal of 1221211201012 is 2101021121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211201013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1369443 + ... + 2077930.

It is an arithmetic number, because the mean of its divisors is an integer number (49662869844).

Almost surely, 2^{1221211201012} is an apocalyptic number.

It is an amenable number.

1221211201012 is a deficient number, since it is larger than the sum of its proper divisors (1162606551500).

1221211201012 is a wasteful number, since it uses less digits than its factorization.

1221211201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447568 (or 3447566 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221211201012 its reverse (2101021121221), we get a palindrome (3322232322233).

The spelling of 1221211201012 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred one thousand, twelve".