18063757421 has 4 divisors (see below), whose sum is σ = 18064248000. Its totient is φ = 18063266844.

The previous prime is 18063757417. The next prime is 18063757429. The reversal of 18063757421 is 12475736081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12475736081 = 89521 ⋅139361.

It is a cyclic number.

It is not a de Polignac number, because 18063757421 - 2² = 18063757417 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 (18063757429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185141 + ... + 265338.

It is an arithmetic number, because the mean of its divisors is an integer number (4516062000).

Almost surely, 2^18063757421 is an apocalyptic number.

It is an amenable number.

18063757421 is a deficient number, since it is larger than the sum of its proper divisors (490579).

18063757421 is an equidigital number, since it uses as much as digits as its factorization.

18063757421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490578.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 18063757421 in words is "eighteen billion, sixty-three million, seven hundred fifty-seven thousand, four hundred twenty-one".