221110210121020 has 96 divisors (see below), whose sum is σ = 507709549912320. Its totient is φ = 80218624412160.

The previous prime is 221110210120999. The next prime is 221110210121039. The reversal of 221110210121020 is 20121012011122.

It is a junction number, because it is equal to n+sod(n) for n = 221110210120985 and 221110210121003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3235930216 + ... + 3235998544.

It is an arithmetic number, because the mean of its divisors is an integer number (5288641144920).

Almost surely, 2^{221110210121020} is an apocalyptic number.

221110210121020 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 221110210121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253854774956160).

221110210121020 is an abundant number, since it is smaller than the sum of its proper divisors (286599339791300).

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

221110210121020 is a wasteful number, since it uses less digits than its factorization.

221110210121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101995 (or 101993 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221110210121020 its reverse (20121012011122), we get a palindrome (241231222132142).

The spelling of 221110210121020 in words is "two hundred twenty-one trillion, one hundred ten billion, two hundred ten million, one hundred twenty-one thousand, twenty".