221222221121020 has 48 divisors (see below), whose sum is σ = 530945686978560. Its totient is φ = 75845853486144.

The previous prime is 221222221120997. The next prime is 221222221121023. The reversal of 221222221121020 is 20121122222122.

It is a super-2 number, since 2×221222221121020² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221222221120982 and 221222221121000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222221121023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12343164 + ... + 24388483.

It is an arithmetic number, because the mean of its divisors is an integer number (11061368478720).

Almost surely, 2^{221222221121020} is an apocalyptic number.

221222221121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222221121020 is an abundant number, since it is smaller than the sum of its proper divisors (309723465857540).

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

221222221121020 is a wasteful number, since it uses less digits than its factorization.

221222221121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36774682 (or 36774680 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221222221121020 its reverse (20121122222122), we get a palindrome (241343343343142).

The spelling of 221222221121020 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty".