221220012012 has 24 divisors (see below), whose sum is σ = 516223705200. Its totient is φ = 73733764416.

The previous prime is 221220011959. The next prime is 221220012061. The reversal of 221220012012 is 210210022122.

It is a junction number, because it is equal to n+sod(n) for n = 221220011982 and 221220012000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631087 + ... + 916902.

It is an arithmetic number, because the mean of its divisors is an integer number (21509321050).

Almost surely, 2^221220012012 is an apocalyptic number.

It is an amenable number.

221220012012 is an abundant number, since it is smaller than the sum of its proper divisors (295003693188).

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

221220012012 is a wasteful number, since it uses less digits than its factorization.

221220012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559905 (or 1559903 counting only the distinct ones).

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

Adding to 221220012012 its reverse (210210022122), we get a palindrome (431430034134).

The spelling of 221220012012 in words is "two hundred twenty-one billion, two hundred twenty million, twelve thousand, twelve".