1210001220 has 96 divisors (see below), whose sum is σ = 3894307200. Its totient is φ = 311536512.

The previous prime is 1210001171. The next prime is 1210001267. The reversal of 1210001220 is 221000121.

It is a Harshad number since it is a multiple of its sum of digits (9).

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, 22974 + ... + 54293.

It is an arithmetic number, because the mean of its divisors is an integer number (40565700).

Almost surely, 2^1210001220 is an apocalyptic number.

1210001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210001220 is an abundant number, since it is smaller than the sum of its proper divisors (2684305980).

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

1210001220 is a wasteful number, since it uses less digits than its factorization.

1210001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77314 (or 77306 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1210001220 is about 34785.0717981148. The cubic root of 1210001220 is about 1065.6025949028.

Adding to 1210001220 its reverse (221000121), we get a palindrome (1431001341).

The spelling of 1210001220 in words is "one billion, two hundred ten million, one thousand, two hundred twenty".