1200173215021 has 24 divisors (see below), whose sum is σ = 1409853029760. Its totient is φ = 1017288919680.

The previous prime is 1200173215009. The next prime is 1200173215049. The reversal of 1200173215021 is 1205123710021.

It is not a de Polignac number, because 1200173215021 - 2¹³ = 1200173206829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200173215121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2506341 + ... + 2946538.

It is an arithmetic number, because the mean of its divisors is an integer number (58743876240).

Almost surely, 2^{1200173215021} is an apocalyptic number.

1200173215021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200173215021 is a deficient number, since it is larger than the sum of its proper divisors (209679814739).

1200173215021 is a wasteful number, since it uses less digits than its factorization.

1200173215021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453025 (or 5453014 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 1200173215021 its reverse (1205123710021), we get a palindrome (2405296925042).

The spelling of 1200173215021 in words is "one trillion, two hundred billion, one hundred seventy-three million, two hundred fifteen thousand, twenty-one".