221220022 has 4 divisors (see below), whose sum is σ = 331830036. Its totient is φ = 110610010.

The previous prime is 221220007. The next prime is 221220037. The reversal of 221220022 is 220022122.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (221220007) and next prime (221220037).

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 221219984 and 221220011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55305004 + ... + 55305007.

It is an arithmetic number, because the mean of its divisors is an integer number (82957509).

Almost surely, 2^221220022 is an apocalyptic number.

221220022 is a deficient number, since it is larger than the sum of its proper divisors (110610014).

221220022 is a wasteful number, since it uses less digits than its factorization.

221220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110610013.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 221220022 is about 14873.4670470607. The cubic root of 221220022 is about 604.7949326623.

Adding to 221220022 its reverse (220022122), we get a palindrome (441242144).

The spelling of 221220022 in words is "two hundred twenty-one million, two hundred twenty thousand, twenty-two".