1200010721523 has 4 divisors (see below), whose sum is σ = 1600014295368. Its totient is φ = 800007147680.

The previous prime is 1200010721519. The next prime is 1200010721527. The reversal of 1200010721523 is 3251270100021.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1200010721519) and next prime (1200010721527).

It is a cyclic number.

It is not a de Polignac number, because 1200010721523 - 2² = 1200010721519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200010721493 and 1200010721502.

It is not an unprimeable number, because it can be changed into a prime (1200010721527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200001786918 + ... + 200001786923.

It is an arithmetic number, because the mean of its divisors is an integer number (400003573842).

Almost surely, 2^{1200010721523} is an apocalyptic number.

1200010721523 is a deficient number, since it is larger than the sum of its proper divisors (400003573845).

1200010721523 is an equidigital number, since it uses as much as digits as its factorization.

1200010721523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400003573844.

The product of its (nonzero) digits is 840, while the sum is 24.

Adding to 1200010721523 its reverse (3251270100021), we get a palindrome (4451280821544).

The spelling of 1200010721523 in words is "one trillion, two hundred billion, ten million, seven hundred twenty-one thousand, five hundred twenty-three".