221221010 has 32 divisors (see below), whose sum is σ = 409888512. Its totient is φ = 85920640.

The previous prime is 221220997. The next prime is 221221037. The reversal of 221221010 is 10122122.

It is a happy number.

221221010 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221220982 and 221221000.

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 15 ways as a sum of consecutive naturals, for example, 59774 + ... + 63366.

It is an arithmetic number, because the mean of its divisors is an integer number (12809016).

Almost surely, 2^221221010 is an apocalyptic number.

221221010 is a deficient number, since it is larger than the sum of its proper divisors (188667502).

221221010 is a wasteful number, since it uses less digits than its factorization.

221221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3778.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221221010 is about 14873.5002605305. The cubic root of 221221010 is about 604.7958330276.

Adding to 221221010 its reverse (10122122), we get a palindrome (231343132).

It can be divided in two parts, 22122 and 1010, that added together give a palindrome (23132).

The spelling of 221221010 in words is "two hundred twenty-one million, two hundred twenty-one thousand, ten".