221220112036 has 36 divisors (see below), whose sum is σ = 491281032816. Its totient is φ = 86189653200.

The previous prime is 221220111979. The next prime is 221220112037. The reversal of 221220112036 is 630211022122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 221220111998 and 221220112016.

It is not an unprimeable number, because it can be changed into a prime (221220112037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51301210 + ... + 51305521.

It is an arithmetic number, because the mean of its divisors is an integer number (13646695356).

Almost surely, 2^221220112036 is an apocalyptic number.

It is an amenable number.

221220112036 is an abundant number, since it is smaller than the sum of its proper divisors (270060920780).

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

221220112036 is a wasteful number, since it uses less digits than its factorization.

221220112036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102606760 (or 102606751 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 221220112036 its reverse (630211022122), we get a palindrome (851431134158).

The spelling of 221220112036 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, thirty-six".