1221204130 has 16 divisors (see below), whose sum is σ = 2219933304. Its totient is φ = 483644800.

The previous prime is 1221204121. The next prime is 1221204133. The reversal of 1221204130 is 314021221.

1221204130 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1033815409 + 187388721 = 32153^2 + 13689^2 .

It is not an unprimeable number, because it can be changed into a prime (1221204133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603547 + ... + 605566.

Almost surely, 2^1221204130 is an apocalyptic number.

1221204130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221204130 is a deficient number, since it is larger than the sum of its proper divisors (998729174).

1221204130 is a wasteful number, since it uses less digits than its factorization.

1221204130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209221.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221204130 is about 34945.7312128391. The cubic root of 1221204130 is about 1068.8811579172.

Adding to 1221204130 its reverse (314021221), we get a palindrome (1535225351).

The spelling of 1221204130 in words is "one billion, two hundred twenty-one million, two hundred four thousand, one hundred thirty".