221222402 has 4 divisors (see below), whose sum is σ = 331833606. Its totient is φ = 110611200.

The previous prime is 221222389. The next prime is 221222413. The reversal of 221222402 is 204222122.

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

It can be written as a sum of positive squares in only one way, i.e., 123232201 + 97990201 = 11101^2 + 9899^2 .

It is a super-2 number, since 2×221222402² = 97878702293299208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55305599 + ... + 55305602.

Almost surely, 2^221222402 is an apocalyptic number.

221222402 is a deficient number, since it is larger than the sum of its proper divisors (110611204).

221222402 is a wasteful number, since it uses less digits than its factorization.

221222402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110611203.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 221222402 is about 14873.5470550908. The cubic root of 221222402 is about 604.7971015539.

Adding to 221222402 its reverse (204222122), we get a palindrome (425444524).

The spelling of 221222402 in words is "two hundred twenty-one million, two hundred twenty-two thousand, four hundred two".