1220134221 has 6 divisors (see below), whose sum is σ = 1762416110. Its totient is φ = 813422808.

The previous prime is 1220134141. The next prime is 1220134243. The reversal of 1220134221 is 1224310221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1203118596 + 17015625 = 34686^2 + 4125^2 .

It is not a de Polignac number, because 1220134221 - 2⁷ = 1220134093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220134194 and 1220134203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220134271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67785226 + ... + 67785243.

Almost surely, 2^1220134221 is an apocalyptic number.

It is an amenable number.

1220134221 is a deficient number, since it is larger than the sum of its proper divisors (542281889).

1220134221 is a wasteful number, since it uses less digits than its factorization.

1220134221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135570475 (or 135570472 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1220134221 is about 34930.4197083287. The cubic root of 1220134221 is about 1068.5689142663.

Adding to 1220134221 its reverse (1224310221), we get a palindrome (2444444442).

The spelling of 1220134221 in words is "one billion, two hundred twenty million, one hundred thirty-four thousand, two hundred twenty-one".