109578786921 has 12 divisors (see below), whose sum is σ = 158299956672. Its totient is φ = 73043530776.

The previous prime is 109578786907. The next prime is 109578786953. The reversal of 109578786921 is 129687875901.

It is not a de Polignac number, because 109578786921 - 2⁹ = 109578786409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109578986921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 671901 + ... + 818906.

It is an arithmetic number, because the mean of its divisors is an integer number (13191663056).

Almost surely, 2^109578786921 is an apocalyptic number.

It is an amenable number.

109578786921 is a deficient number, since it is larger than the sum of its proper divisors (48721169751).

109578786921 is a wasteful number, since it uses less digits than its factorization.

109578786921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498980 (or 1498977 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 63.

The spelling of 109578786921 in words is "one hundred nine billion, five hundred seventy-eight million, seven hundred eighty-six thousand, nine hundred twenty-one".