221121210110020 has 96 divisors (see below), whose sum is σ = 517256124086016. Its totient is φ = 78727358822400.

The previous prime is 221121210109981. The next prime is 221121210110117. The reversal of 221121210110020 is 20011012121122.

It is a super-2 number, since 2×221121210110020² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221121210109976 and 221121210110003.

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, 48049576 + ... + 52450015.

It is an arithmetic number, because the mean of its divisors is an integer number (5388084625896).

Almost surely, 2^{221121210110020} is an apocalyptic number.

221121210110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121210110020 is an abundant number, since it is smaller than the sum of its proper divisors (296134913975996).

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

221121210110020 is a wasteful number, since it uses less digits than its factorization.

221121210110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100499821 (or 100499819 counting only the distinct ones).

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

Adding to 221121210110020 its reverse (20011012121122), we get a palindrome (241132222231142).

The spelling of 221121210110020 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred ten million, one hundred ten thousand, twenty".