221152426 has 12 divisors (see below), whose sum is σ = 364627746. Its totient is φ = 100523720.

The previous prime is 221152409. The next prime is 221152427. The reversal of 221152426 is 624251122.

It can be written as a sum of positive squares in only one way, i.e., 176863401 + 44289025 = 13299^2 + 6655^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221152426.

It is not an unprimeable number, because it can be changed into a prime (221152427) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 456685 + ... + 457168.

Almost surely, 2^221152426 is an apocalyptic number.

221152426 is a deficient number, since it is larger than the sum of its proper divisors (143475320).

221152426 is a wasteful number, since it uses less digits than its factorization.

221152426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913877 (or 913866 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 221152426 is about 14871.1945048137. The cubic root of 221152426 is about 604.7333259979.

The spelling of 221152426 in words is "two hundred twenty-one million, one hundred fifty-two thousand, four hundred twenty-six".