221210404012120 has 64 divisors (see below), whose sum is σ = 498683259728640. Its totient is φ = 88313679168000.

The previous prime is 221210404012093. The next prime is 221210404012121. The reversal of 221210404012120 is 21210404012122.

It is a junction number, because it is equal to n+sod(n) for n = 221210404012091 and 221210404012100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210404012121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42447730 + ... + 47373310.

It is an arithmetic number, because the mean of its divisors is an integer number (7791925933260).

Almost surely, 2^{221210404012120} is an apocalyptic number.

221210404012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210404012120 is an abundant number, since it is smaller than the sum of its proper divisors (277472855716520).

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

221210404012120 is a wasteful number, since it uses less digits than its factorization.

221210404012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927756 (or 4927752 counting only the distinct ones).

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

Adding to 221210404012120 its reverse (21210404012122), we get a palindrome (242420808024242).

The spelling of 221210404012120 in words is "two hundred twenty-one trillion, two hundred ten billion, four hundred four million, twelve thousand, one hundred twenty".