105740721521 has 16 divisors (see below), whose sum is σ = 110091009600. Its totient is φ = 101478225408.

The previous prime is 105740721517. The next prime is 105740721523. The reversal of 105740721521 is 125127047501.

It is a cyclic number.

It is not a de Polignac number, because 105740721521 - 2² = 105740721517 is a prime.

It is a super-2 number, since 2×105740721521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105740721523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5391485 + ... + 5411061.

It is an arithmetic number, because the mean of its divisors is an integer number (6880688100).

Almost surely, 2^105740721521 is an apocalyptic number.

It is an amenable number.

105740721521 is a deficient number, since it is larger than the sum of its proper divisors (4350288079).

105740721521 is a wasteful number, since it uses less digits than its factorization.

105740721521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21808.

The product of its (nonzero) digits is 19600, while the sum is 35.

The spelling of 105740721521 in words is "one hundred five billion, seven hundred forty million, seven hundred twenty-one thousand, five hundred twenty-one".