105523055021 has 4 divisors (see below), whose sum is σ = 105527029344. Its totient is φ = 105519080700.

The previous prime is 105523054969. The next prime is 105523055051. The reversal of 105523055021 is 120550325501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 105523055021 - 2³⁰ = 104449313197 is a prime.

It is a super-2 number, since 2×105523055021² (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 (105523055051) 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, 1947065 + ... + 2000526.

It is an arithmetic number, because the mean of its divisors is an integer number (26381757336).

Almost surely, 2^105523055021 is an apocalyptic number.

It is an amenable number.

105523055021 is a deficient number, since it is larger than the sum of its proper divisors (3974323).

105523055021 is an equidigital number, since it uses as much as digits as its factorization.

105523055021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974322.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 105523055021 in words is "one hundred five billion, five hundred twenty-three million, fifty-five thousand, twenty-one".