1221212022220 has 12 divisors (see below), whose sum is σ = 2564545246704. Its totient is φ = 488484808880.

The previous prime is 1221212022167. The next prime is 1221212022227. The reversal of 1221212022220 is 222202121221.

It is not an unprimeable number, because it can be changed into a prime (1221212022227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30530300536 + ... + 30530300575.

It is an arithmetic number, because the mean of its divisors is an integer number (213712103892).

Almost surely, 2^{1221212022220} is an apocalyptic number.

1221212022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221212022220 is an abundant number, since it is smaller than the sum of its proper divisors (1343333224484).

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

1221212022220 is a wasteful number, since it uses less digits than its factorization.

1221212022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61060601120 (or 61060601118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1221212022220 its reverse (222202121221), we get a palindrome (1443414143441).

Subtracting from 1221212022220 its reverse (222202121221), we obtain a palindrome (999009900999).

The spelling of 1221212022220 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, twenty-two thousand, two hundred twenty".