1221201211012 has 48 divisors (see below), whose sum is σ = 2323720806400. Its totient is φ = 559424530080.

The previous prime is 1221201210991. The next prime is 1221201211037. The reversal of 1221201211012 is 2101121021221.

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, 3319189 + ... + 3668707.

Almost surely, 2^{1221201211012} is an apocalyptic number.

It is an amenable number.

1221201211012 is a deficient number, since it is larger than the sum of its proper divisors (1102519595388).

1221201211012 is a wasteful number, since it uses less digits than its factorization.

1221201211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351056 (or 351054 counting only the distinct ones).

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

Adding to 1221201211012 its reverse (2101121021221), we get a palindrome (3322322232233).

The spelling of 1221201211012 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, twelve".