18107462921 has 4 divisors (see below), whose sum is σ = 18156008772. Its totient is φ = 18058917072.

The previous prime is 18107462903. The next prime is 18107462929. The reversal of 18107462921 is 12926470181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12926470181 = 3989 ⋅3240529.

It can be written as a sum of positive squares in 2 ways, for example, as 10756801225 + 7350661696 = 103715^2 + 85736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18107462921 is a prime.

It is a super-3 number, since 3×18107462921³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18107462929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24272366 + ... + 24273111.

It is an arithmetic number, because the mean of its divisors is an integer number (4539002193).

Almost surely, 2^18107462921 is an apocalyptic number.

It is an amenable number.

18107462921 is a deficient number, since it is larger than the sum of its proper divisors (48545851).

18107462921 is an equidigital number, since it uses as much as digits as its factorization.

18107462921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48545850.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 18107462921 in words is "eighteen billion, one hundred seven million, four hundred sixty-two thousand, nine hundred twenty-one".