221012020101220 has 12 divisors (see below), whose sum is σ = 464125242212604. Its totient is φ = 88404808040480.

The previous prime is 221012020101121. The next prime is 221012020101241. The reversal of 221012020101220 is 22101020210122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 94945652928036 + 126066367173184 = 9744006^2 + 11227928^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221012020101194 and 221012020101203.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5525300502511 + ... + 5525300502550.

It is an arithmetic number, because the mean of its divisors is an integer number (38677103517717).

Almost surely, 2^{221012020101220} is an apocalyptic number.

221012020101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012020101220 is an abundant number, since it is smaller than the sum of its proper divisors (243113222111384).

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

221012020101220 is a wasteful number, since it uses less digits than its factorization.

221012020101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11050601005070 (or 11050601005068 counting only the distinct ones).

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

Adding to 221012020101220 its reverse (22101020210122), we get a palindrome (243113040311342).

The spelling of 221012020101220 in words is "two hundred twenty-one trillion, twelve billion, twenty million, one hundred one thousand, two hundred twenty".