1221001211212 has 6 divisors (see below), whose sum is σ = 2136752119628. Its totient is φ = 610500605604.

The previous prime is 1221001211191. The next prime is 1221001211231. The reversal of 1221001211212 is 2121121001221.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152625151398 + ... + 152625151405.

Almost surely, 2^{1221001211212} is an apocalyptic number.

It is an amenable number.

1221001211212 is a deficient number, since it is larger than the sum of its proper divisors (915750908416).

1221001211212 is a wasteful number, since it uses less digits than its factorization.

1221001211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305250302807 (or 305250302805 counting only the distinct ones).

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

Adding to 1221001211212 its reverse (2121121001221), we get a palindrome (3342122212433).

The spelling of 1221001211212 in words is "one trillion, two hundred twenty-one billion, one million, two hundred eleven thousand, two hundred twelve".