1200021522172 has 12 divisors (see below), whose sum is σ = 2290950178776. Its totient is φ = 545464328240.

The previous prime is 1200021522169. The next prime is 1200021522233. The reversal of 1200021522172 is 2712251200021.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13636608163 + ... + 13636608250.

It is an arithmetic number, because the mean of its divisors is an integer number (190912514898).

Almost surely, 2^{1200021522172} is an apocalyptic number.

It is an amenable number.

1200021522172 is a deficient number, since it is larger than the sum of its proper divisors (1090928656604).

1200021522172 is a wasteful number, since it uses less digits than its factorization.

1200021522172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27273216428 (or 27273216426 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 1200021522172 its reverse (2712251200021), we get a palindrome (3912272722193).

The spelling of 1200021522172 in words is "one trillion, two hundred billion, twenty-one million, five hundred twenty-two thousand, one hundred seventy-two".