221620036 has 24 divisors (see below), whose sum is σ = 426333600. Its totient is φ = 99964800.

The previous prime is 221620033. The next prime is 221620051. The reversal of 221620036 is 630026122.

It is a happy number.

221620036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 221619989 and 221620016.

It is not an unprimeable number, because it can be changed into a prime (221620033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13461 + ... + 24988.

It is an arithmetic number, because the mean of its divisors is an integer number (17763900).

Almost surely, 2^221620036 is an apocalyptic number.

It is an amenable number.

221620036 is a deficient number, since it is larger than the sum of its proper divisors (204713564).

221620036 is a wasteful number, since it uses less digits than its factorization.

221620036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38595 (or 38593 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 221620036 is about 14886.9082082211. The cubic root of 221620036 is about 605.1592468350.

Adding to 221620036 its reverse (630026122), we get a palindrome (851646158).

The spelling of 221620036 in words is "two hundred twenty-one million, six hundred twenty thousand, thirty-six".