1200001213123 has 8 divisors (see below), whose sum is σ = 1202933571840. Its totient is φ = 1197069759240.

The previous prime is 1200001213091. The next prime is 1200001213129. The reversal of 1200001213123 is 3213121000021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200001213123 - 2⁵ = 1200001213091 is a prime.

It is a super-2 number, since 2×1200001213123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200001213097 and 1200001213106.

It is not an unprimeable number, because it can be changed into a prime (1200001213129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2468586 + ... + 2914432.

It is an arithmetic number, because the mean of its divisors is an integer number (150366696480).

Almost surely, 2^{1200001213123} is an apocalyptic number.

1200001213123 is a deficient number, since it is larger than the sum of its proper divisors (2932358717).

1200001213123 is an equidigital number, since it uses as much as digits as its factorization.

1200001213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452417.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1200001213123 its reverse (3213121000021), we get a palindrome (4413122213144).

The spelling of 1200001213123 in words is "one trillion, two hundred billion, one million, two hundred thirteen thousand, one hundred twenty-three".