1002211221 has 64 divisors (see below), whose sum is σ = 1592524800. Its totient is φ = 554097600.

The previous prime is 1002211213. The next prime is 1002211237. The reversal of 1002211221 is 1221122001.

It is not a de Polignac number, because 1002211221 - 2³ = 1002211213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002211197 and 1002211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002211211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2092060 + ... + 2092538.

It is an arithmetic number, because the mean of its divisors is an integer number (24883200).

Almost surely, 2^1002211221 is an apocalyptic number.

1002211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1002211221 is a deficient number, since it is larger than the sum of its proper divisors (590313579).

1002211221 is a wasteful number, since it uses less digits than its factorization.

1002211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1002211221 is about 31657.7197694338. The cubic root of 1002211221 is about 1000.7365310555.

Adding to 1002211221 its reverse (1221122001), we get a palindrome (2223333222).

The spelling of 1002211221 in words is "one billion, two million, two hundred eleven thousand, two hundred twenty-one".