111720221512 has 16 divisors (see below), whose sum is σ = 221797498860. Its totient is φ = 52574221824.

The previous prime is 111720221497. The next prime is 111720221603. The reversal of 111720221512 is 215122027111.

It can be written as a sum of positive squares in 2 ways, for example, as 97522545796 + 14197675716 = 312286^2 + 119154^2 .

It is a super-2 number, since 2×111720221512² (a number of 23 digits) contains 22 as substring.

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, 410735973 + ... + 410736244.

Almost surely, 2^111720221512 is an apocalyptic number.

It is an amenable number.

111720221512 is a deficient number, since it is larger than the sum of its proper divisors (110077277348).

111720221512 is a wasteful number, since it uses less digits than its factorization.

111720221512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821472240 (or 821472236 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 111720221512 its reverse (215122027111), we get a palindrome (326842248623).

The spelling of 111720221512 in words is "one hundred eleven billion, seven hundred twenty million, two hundred twenty-one thousand, five hundred twelve".