221221022 has 32 divisors (see below), whose sum is σ = 374989824. Its totient is φ = 96969600.

The previous prime is 221220997. The next prime is 221221037. The reversal of 221221022 is 220122122.

221221022 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 = 221220988 and 221221006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372758 + ... + 373350.

It is an arithmetic number, because the mean of its divisors is an integer number (11718432).

Almost surely, 2^221221022 is an apocalyptic number.

221221022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221221022 is a deficient number, since it is larger than the sum of its proper divisors (153768802).

221221022 is a wasteful number, since it uses less digits than its factorization.

221221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221221022 is about 14873.5006639325. The cubic root of 221221022 is about 604.7958439632.

Adding to 221221022 its reverse (220122122), we get a palindrome (441343144).

The spelling of 221221022 in words is "two hundred twenty-one million, two hundred twenty-one thousand, twenty-two".