221021001122020 has 192 divisors, whose sum is σ = 543543172623360. Its totient is φ = 74636024486400.

The previous prime is 221021001121957. The next prime is 221021001122063. The reversal of 221021001122020 is 20221100120122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221021001121985 and 221021001122003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 241242919 + ... + 242157361.

It is an arithmetic number, because the mean of its divisors is an integer number (2830954024080).

Almost surely, 2^{221021001122020} is an apocalyptic number.

221021001122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221021001122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271771586311680).

221021001122020 is an abundant number, since it is smaller than the sum of its proper divisors (322522171501340).

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

221021001122020 is a wasteful number, since it uses less digits than its factorization.

221021001122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915626 (or 915624 counting only the distinct ones).

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

Adding to 221021001122020 its reverse (20221100120122), we get a palindrome (241242101242142).

The spelling of 221021001122020 in words is "two hundred twenty-one trillion, twenty-one billion, one million, one hundred twenty-two thousand, twenty".