1221002210 has 32 divisors (see below), whose sum is σ = 2227962240. Its totient is φ = 481719168.

The previous prime is 1221002207. The next prime is 1221002213. The reversal of 1221002210 is 122001221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221002207) and next prime (1221002213).

It is a junction number, because it is equal to n+sod(n) for n = 1221002191 and 1221002200.

It is not an unprimeable number, because it can be changed into a prime (1221002213) by changing a digit.

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, 936419 + ... + 937721.

It is an arithmetic number, because the mean of its divisors is an integer number (69623820).

Almost surely, 2^1221002210 is an apocalyptic number.

1221002210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221002210 is a deficient number, since it is larger than the sum of its proper divisors (1006960030).

1221002210 is a wasteful number, since it uses less digits than its factorization.

1221002210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522.

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

The square root of 1221002210 is about 34942.8420423983. The cubic root of 1221002210 is about 1068.8222432841.

Adding to 1221002210 its reverse (122001221), we get a palindrome (1343003431).

The spelling of 1221002210 in words is "one billion, two hundred twenty-one million, two thousand, two hundred ten".