1220000204529 has 12 divisors (see below), whose sum is σ = 1762490866500. Its totient is φ = 813209616384.

The previous prime is 1220000204513. The next prime is 1220000204551. The reversal of 1220000204529 is 9254020000221.

It is a happy number.

1220000204529 is a `hidden beast` number, since 1 + 2 + 200 + 0 + 0 + 2 + 0 + 452 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 771270368400 + 448729836129 = 878220^2 + 669873^2 .

It is not a de Polignac number, because 1220000204529 - 2⁴ = 1220000204513 is a prime.

It is a super-2 number, since 2×1220000204529² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220000204429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10258704 + ... + 10376945.

It is an arithmetic number, because the mean of its divisors is an integer number (146874238875).

Almost surely, 2^{1220000204529} is an apocalyptic number.

It is an amenable number.

1220000204529 is a deficient number, since it is larger than the sum of its proper divisors (542490661971).

1220000204529 is a wasteful number, since it uses less digits than its factorization.

1220000204529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20642224 (or 20642221 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 1220000204529 in words is "one trillion, two hundred twenty billion, two hundred four thousand, five hundred twenty-nine".