18641541021 has 16 divisors (see below), whose sum is σ = 25622092800. Its totient is φ = 12046840128.

The previous prime is 18641540999. The next prime is 18641541031. The reversal of 18641541021 is 12014514681.

It is not a de Polignac number, because 18641541021 - 2¹¹ = 18641538973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18641541031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282301 + ... + 342018.

It is an arithmetic number, because the mean of its divisors is an integer number (1601380800).

Almost surely, 2^18641541021 is an apocalyptic number.

It is an amenable number.

18641541021 is a deficient number, since it is larger than the sum of its proper divisors (6980551779).

18641541021 is a wasteful number, since it uses less digits than its factorization.

18641541021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624628.

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 18641541021 in words is "eighteen billion, six hundred forty-one million, five hundred forty-one thousand, twenty-one".