1221020211212 has 24 divisors (see below), whose sum is σ = 2138120409600. Its totient is φ = 610128795536.

The previous prime is 1221020211193. The next prime is 1221020211247. The reversal of 1221020211212 is 2121120201221.

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, 47939993 + ... + 47965455.

It is an arithmetic number, because the mean of its divisors is an integer number (89088350400).

Almost surely, 2^{1221020211212} is an apocalyptic number.

It is an amenable number.

1221020211212 is a deficient number, since it is larger than the sum of its proper divisors (917100198388).

1221020211212 is a wasteful number, since it uses less digits than its factorization.

1221020211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32485 (or 32483 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221020211212 its reverse (2121120201221), we get a palindrome (3342140412433).

Subtracting 1221020211212 from its reverse (2121120201221), we obtain a palindrome (900099990009).

The spelling of 1221020211212 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred eleven thousand, two hundred twelve".