137520221018 has 8 divisors (see below), whose sum is σ = 206282079648. Its totient is φ = 68759527804.

The previous prime is 137520221017. The next prime is 137520221021. The reversal of 137520221018 is 810122025731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×137520221018² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (137520221017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119555 + ... + 537897.

It is an arithmetic number, because the mean of its divisors is an integer number (25785259956).

Almost surely, 2^137520221018 is an apocalyptic number.

137520221018 is a deficient number, since it is larger than the sum of its proper divisors (68761858630).

137520221018 is a wasteful number, since it uses less digits than its factorization.

137520221018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582708.

The product of its (nonzero) digits is 6720, while the sum is 32.

Adding to 137520221018 its reverse (810122025731), we get a palindrome (947642246749).

The spelling of 137520221018 in words is "one hundred thirty-seven billion, five hundred twenty million, two hundred twenty-one thousand, eighteen".