1221222020022 has 20 divisors (see below), whose sum is σ = 2736441934116. Its totient is φ = 407074006620.

The previous prime is 1221222020009. The next prime is 1221222020027. The reversal of 1221222020022 is 2200202221221.

1221222020022 is a `hidden beast` number, since 1 + 221 + 2 + 220 + 200 + 22 = 666.

It is a super-2 number, since 2×1221222020022² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221222019977 and 1221222020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222020027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3769203604 + ... + 3769203927.

Almost surely, 2^{1221222020022} is an apocalyptic number.

1221222020022 is an abundant number, since it is smaller than the sum of its proper divisors (1515219914094).

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

1221222020022 is an equidigital number, since it uses as much as digits as its factorization.

1221222020022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7538407545 (or 7538407536 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 1221222020022 its reverse (2200202221221), we get a palindrome (3421424241243).

The spelling of 1221222020022 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty thousand, twenty-two".