1200122056521 has 12 divisors (see below), whose sum is σ = 1752987274740. Its totient is φ = 791091692160.

The previous prime is 1200122056451. The next prime is 1200122056607. The reversal of 1200122056521 is 1256502210021.

1200122056521 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 1 + 2 + 2 + 0 + 5 + 652 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 379351287225 + 820770769296 = 615915^2 + 905964^2 .

It is not a de Polignac number, because 1200122056521 - 2¹³ = 1200122048329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200122056321) 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, 749139060 + ... + 749140661.

It is an arithmetic number, because the mean of its divisors is an integer number (146082272895).

Almost surely, 2^{1200122056521} is an apocalyptic number.

It is an amenable number.

1200122056521 is a deficient number, since it is larger than the sum of its proper divisors (552865218219).

1200122056521 is a wasteful number, since it uses less digits than its factorization.

1200122056521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498279816 (or 1498279813 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 1200122056521 its reverse (1256502210021), we get a palindrome (2456624266542).

The spelling of 1200122056521 in words is "one trillion, two hundred billion, one hundred twenty-two million, fifty-six thousand, five hundred twenty-one".