18709422421 has 8 divisors (see below), whose sum is σ = 19175580864. Its totient is φ = 18244675680.

The previous prime is 18709422419. The next prime is 18709422451. The reversal of 18709422421 is 12422490781.

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

It is a cyclic number.

It is not a de Polignac number, because 18709422421 - 2¹ = 18709422419 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 (18709422451) 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, 326065 + ... + 379126.

It is an arithmetic number, because the mean of its divisors is an integer number (2396947608).

Almost surely, 2^18709422421 is an apocalyptic number.

It is an amenable number.

18709422421 is a deficient number, since it is larger than the sum of its proper divisors (466158443).

18709422421 is an equidigital number, since it uses as much as digits as its factorization.

18709422421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705851.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 18709422421 in words is "eighteen billion, seven hundred nine million, four hundred twenty-two thousand, four hundred twenty-one".