221221002 has 64 divisors (see below), whose sum is σ = 468840960. Its totient is φ = 69512256.

The previous prime is 221220997. The next prime is 221221037. The reversal of 221221002 is 200122122.

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 in 31 ways as a sum of consecutive naturals, for example, 1591449 + ... + 1591587.

It is an arithmetic number, because the mean of its divisors is an integer number (7325640).

Almost surely, 2^221221002 is an apocalyptic number.

It is a pronic number, being equal to 14873×14874.

221221002 is an abundant number, since it is smaller than the sum of its proper divisors (247619958).

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

221221002 is a wasteful number, since it uses less digits than its factorization.

221221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221221002 is about 14873.4999915958. The cubic root of 221221002 is about 604.7958257372.

Adding to 221221002 its reverse (200122122), we get a palindrome (421343124).

The spelling of 221221002 in words is "two hundred twenty-one million, two hundred twenty-one thousand, two".