1200012120321 has 16 divisors (see below), whose sum is σ = 1828622615424. Its totient is φ = 685708942464.

The previous prime is 1200012120317. The next prime is 1200012120361. The reversal of 1200012120321 is 1230212100021.

It is not a de Polignac number, because 1200012120321 - 2² = 1200012120317 is a prime.

It is a super-2 number, since 2×1200012120321² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1200012120321.

It is not an unprimeable number, because it can be changed into a prime (1200012120311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 764445 + ... + 1727541.

It is an arithmetic number, because the mean of its divisors is an integer number (114288913464).

Almost surely, 2^{1200012120321} is an apocalyptic number.

It is an amenable number.

1200012120321 is a deficient number, since it is larger than the sum of its proper divisors (628610495103).

1200012120321 is an equidigital number, since it uses as much as digits as its factorization.

1200012120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022440.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1200012120321 its reverse (1230212100021), we get a palindrome (2430224220342).

The spelling of 1200012120321 in words is "one trillion, two hundred billion, twelve million, one hundred twenty thousand, three hundred twenty-one".