18106251821 has 8 divisors (see below), whose sum is σ = 20875982784. Its totient is φ = 15382301760.

The previous prime is 18106251811. The next prime is 18106251827. The reversal of 18106251821 is 12815260181.

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

It is not a de Polignac number, because 18106251821 - 2¹⁰ = 18106250797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18106251827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11444375 + ... + 11445956.

It is an arithmetic number, because the mean of its divisors is an integer number (2609497848).

Almost surely, 2^18106251821 is an apocalyptic number.

It is an amenable number.

18106251821 is a deficient number, since it is larger than the sum of its proper divisors (2769730963).

18106251821 is a wasteful number, since it uses less digits than its factorization.

18106251821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22890451.

The product of its (nonzero) digits is 7680, while the sum is 35.

The spelling of 18106251821 in words is "eighteen billion, one hundred six million, two hundred fifty-one thousand, eight hundred twenty-one".