221222310 has 16 divisors (see below), whose sum is σ = 530933616. Its totient is φ = 58992608.

The previous prime is 221222299. The next prime is 221222311. The reversal of 221222310 is 13222122.

It is a happy number.

It is a super-2 number, since 2×221222310² = 97878620883472200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221222310.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222311) 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, 3687009 + ... + 3687068.

It is an arithmetic number, because the mean of its divisors is an integer number (33183351).

Almost surely, 2^221222310 is an apocalyptic number.

221222310 is an abundant number, since it is smaller than the sum of its proper divisors (309711306).

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

221222310 is a wasteful number, since it uses less digits than its factorization.

221222310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374087.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221222310 is about 14873.5439623514. The cubic root of 221222310 is about 604.7970177147.

Adding to 221222310 its reverse (13222122), we get a palindrome (234444432).

The spelling of 221222310 in words is "two hundred twenty-one million, two hundred twenty-two thousand, three hundred ten".