1221120220012 has 24 divisors (see below), whose sum is σ = 2664262298880. Its totient is φ = 475761124560.

The previous prime is 1221120219961. The next prime is 1221120220013. The reversal of 1221120220012 is 2100220211221.

It is a happy number.

It is a super-2 number, since 2×1221120220012² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221120220013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1982337712 + ... + 1982338327.

It is an arithmetic number, because the mean of its divisors is an integer number (111010929120).

Almost surely, 2^{1221120220012} is an apocalyptic number.

It is an amenable number.

1221120220012 is an abundant number, since it is smaller than the sum of its proper divisors (1443142078868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221120220012 is a wasteful number, since it uses less digits than its factorization.

1221120220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964676061 (or 3964676059 counting only the distinct ones).

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

Adding to 1221120220012 its reverse (2100220211221), we get a palindrome (3321340431233).

The spelling of 1221120220012 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, twelve".