221221020012 has 48 divisors (see below), whose sum is σ = 528386073600. Its totient is φ = 71998250688.

The previous prime is 221221019993. The next prime is 221221020173. The reversal of 221221020012 is 210020122122.

It is a junction number, because it is equal to n+sod(n) for n = 221221019973 and 221221020000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309989 + ... + 1469187.

It is an arithmetic number, because the mean of its divisors is an integer number (11008043200).

Almost surely, 2^221221020012 is an apocalyptic number.

It is an amenable number.

221221020012 is an abundant number, since it is smaller than the sum of its proper divisors (307165053588).

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

221221020012 is a wasteful number, since it uses less digits than its factorization.

221221020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161942 (or 161940 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221221020012 its reverse (210020122122), we get a palindrome (431241142134).

The spelling of 221221020012 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty thousand, twelve".