221312553146 has 4 divisors (see below), whose sum is σ = 331968829722. Its totient is φ = 110656276572.

The previous prime is 221312553139. The next prime is 221312553167. The reversal of 221312553146 is 641355213122.

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., 133601215225 + 87711337921 = 365515^2 + 296161^2 .

It is a Curzon number.

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, 55328138285 + ... + 55328138288.

Almost surely, 2^221312553146 is an apocalyptic number.

221312553146 is a deficient number, since it is larger than the sum of its proper divisors (110656276576).

221312553146 is a wasteful number, since it uses less digits than its factorization.

221312553146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110656276575.

The product of its digits is 43200, while the sum is 35.

Adding to 221312553146 its reverse (641355213122), we get a palindrome (862667766268).

The spelling of 221312553146 in words is "two hundred twenty-one billion, three hundred twelve million, five hundred fifty-three thousand, one hundred forty-six".