107520721021 has 24 divisors (see below), whose sum is σ = 129899048760. Its totient is φ = 88662131712.

The previous prime is 107520721019. The next prime is 107520721037. The reversal of 107520721021 is 120127025701.

It can be written as a sum of positive squares in 4 ways, for example, as 8670216996 + 98850504025 = 93114^2 + 314405^2 .

It is not a de Polignac number, because 107520721021 - 2¹ = 107520721019 is a prime.

It is a super-2 number, since 2×107520721021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (107520721621) 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, 171820 + ... + 494533.

It is an arithmetic number, because the mean of its divisors is an integer number (5412460365).

Almost surely, 2^107520721021 is an apocalyptic number.

It is an amenable number.

107520721021 is a deficient number, since it is larger than the sum of its proper divisors (22378327739).

107520721021 is an equidigital number, since it uses as much as digits as its factorization.

107520721021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666493 (or 666486 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 28.

Adding to 107520721021 its reverse (120127025701), we get a palindrome (227647746722).

The spelling of 107520721021 in words is "one hundred seven billion, five hundred twenty million, seven hundred twenty-one thousand, twenty-one".