21003929185 has 8 divisors (see below), whose sum is σ = 25230678336. Its totient is φ = 16785834480.

The previous prime is 21003929179. The next prime is 21003929201. The reversal of 21003929185 is 58192930012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21003929185 - 2⁷ = 21003929057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2158269 + ... + 2167978.

It is an arithmetic number, because the mean of its divisors is an integer number (3153834792).

Almost surely, 2^21003929185 is an apocalyptic number.

It is an amenable number.

21003929185 is a deficient number, since it is larger than the sum of its proper divisors (4226749151).

21003929185 is an equidigital number, since it uses as much as digits as its factorization.

21003929185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327223.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 21003929185 in words is "twenty-one billion, three million, nine hundred twenty-nine thousand, one hundred eighty-five".