185000001921 has 40 divisors (see below), whose sum is σ = 316089829440. Its totient is φ = 105629912352.

The previous prime is 185000001917. The next prime is 185000001941. The reversal of 185000001921 is 129100000581.

It is not a de Polignac number, because 185000001921 - 2² = 185000001917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (185000001941) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 584275 + ... + 843431.

It is an arithmetic number, because the mean of its divisors is an integer number (7902245736).

Almost surely, 2^185000001921 is an apocalyptic number.

It is an amenable number.

185000001921 is a deficient number, since it is larger than the sum of its proper divisors (131089827519).

185000001921 is a wasteful number, since it uses less digits than its factorization.

185000001921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260435 (or 260426 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The spelling of 185000001921 in words is "one hundred eighty-five billion, one thousand, nine hundred twenty-one".