1111222120172 has 12 divisors (see below), whose sum is σ = 1944670757400. Its totient is φ = 555601903776.

The previous prime is 1111222120171. The next prime is 1111222120189. The reversal of 1111222120172 is 2710212221111.

It is not an unprimeable number, because it can be changed into a prime (1111222120171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012297 + ... + 2504352.

It is an arithmetic number, because the mean of its divisors is an integer number (162055896450).

Almost surely, 2^{1111222120172} is an apocalyptic number.

It is an amenable number.

1111222120172 is a deficient number, since it is larger than the sum of its proper divisors (833448637228).

1111222120172 is a wasteful number, since it uses less digits than its factorization.

1111222120172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578160 (or 4578158 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 1111222120172 its reverse (2710212221111), we get a palindrome (3821434341283).

The spelling of 1111222120172 in words is "one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twenty thousand, one hundred seventy-two".