221211430442 has 4 divisors (see below), whose sum is σ = 331817145666. Its totient is φ = 110605715220.

The previous prime is 221211430423. The next prime is 221211430459. The reversal of 221211430442 is 244034112122.

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., 174248639761 + 46962790681 = 417431^2 + 216709^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55302857609 + ... + 55302857612.

Almost surely, 2^221211430442 is an apocalyptic number.

221211430442 is a deficient number, since it is larger than the sum of its proper divisors (110605715224).

221211430442 is a wasteful number, since it uses less digits than its factorization.

221211430442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110605715223.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 221211430442 its reverse (244034112122), we get a palindrome (465245542564).

The spelling of 221211430442 in words is "two hundred twenty-one billion, two hundred eleven million, four hundred thirty thousand, four hundred forty-two".