105780913921 has 4 divisors (see below), whose sum is σ = 108031571712. Its totient is φ = 103530256132.

The previous prime is 105780913907. The next prime is 105780913939. The reversal of 105780913921 is 129319087501.

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 105780913921 - 2⁹ = 105780913409 is a prime.

It is a super-2 number, since 2×105780913921² (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 (105780913961) 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, 1125328825 + ... + 1125328918.

It is an arithmetic number, because the mean of its divisors is an integer number (27007892928).

Almost surely, 2^105780913921 is an apocalyptic number.

It is an amenable number.

105780913921 is a deficient number, since it is larger than the sum of its proper divisors (2250657791).

105780913921 is an equidigital number, since it uses as much as digits as its factorization.

105780913921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250657790.

The product of its (nonzero) digits is 136080, while the sum is 46.

The spelling of 105780913921 in words is "one hundred five billion, seven hundred eighty million, nine hundred thirteen thousand, nine hundred twenty-one".