221211004 has 36 divisors (see below), whose sum is σ = 469994896. Its totient is φ = 89224704.

The previous prime is 221210993. The next prime is 221211017. The reversal of 221211004 is 400112122.

It is a happy number.

It is a congruent 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 in 11 ways as a sum of consecutive naturals, for example, 5577 + ... + 21760.

Almost surely, 2^221211004 is an apocalyptic number.

It is an amenable number.

221211004 is an abundant number, since it is smaller than the sum of its proper divisors (248783892).

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

221211004 is a wasteful number, since it uses less digits than its factorization.

221211004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27382 (or 27363 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221211004 is about 14873.1638866786. The cubic root of 221211004 is about 604.7867144266.

Adding to 221211004 its reverse (400112122), we get a palindrome (621323126).

The spelling of 221211004 in words is "two hundred twenty-one million, two hundred eleven thousand, four".