1200123402121 has 16 divisors (see below), whose sum is σ = 1409776646400. Its totient is φ = 1021168569120.

The previous prime is 1200123402089. The next prime is 1200123402173. The reversal of 1200123402121 is 1212043210021.

It is not a de Polignac number, because 1200123402121 - 2⁵ = 1200123402089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200123102121) 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, 12722725 + ... + 12816706.

It is an arithmetic number, because the mean of its divisors is an integer number (88111040400).

Almost surely, 2^{1200123402121} is an apocalyptic number.

It is an amenable number.

1200123402121 is a deficient number, since it is larger than the sum of its proper divisors (209653244279).

1200123402121 is an equidigital number, since it uses as much as digits as its factorization.

1200123402121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25539589 (or 25539575 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1200123402121 its reverse (1212043210021), we get a palindrome (2412166612142).

The spelling of 1200123402121 in words is "one trillion, two hundred billion, one hundred twenty-three million, four hundred two thousand, one hundred twenty-one".