221121020122020 has 36 divisors (see below), whose sum is σ = 670733761037340. Its totient is φ = 58965605365824.

The previous prime is 221121020121979. The next prime is 221121020122049. The reversal of 221121020122020 is 20221020121122.

It is a happy number.

221121020122020 is a `hidden beast` number, since 2 + 2 + 11 + 210 + 201 + 220 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34799994319104 + 186321025802916 = 5899152^2 + 13649946^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 221121020121984 and 221121020122002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 614225055715 + ... + 614225056074.

Almost surely, 2^{221121020122020} is an apocalyptic number.

221121020122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121020122020 is an abundant number, since it is smaller than the sum of its proper divisors (449612740915320).

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

221121020122020 is a wasteful number, since it uses less digits than its factorization.

221121020122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228450111804 (or 1228450111799 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221121020122020 its reverse (20221020121122), we get a palindrome (241342040243142).

The spelling of 221121020122020 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twenty million, one hundred twenty-two thousand, twenty".