18428405821 has 8 divisors (see below), whose sum is σ = 21182776704. Its totient is φ = 15704470320.

The previous prime is 18428405813. The next prime is 18428405839. The reversal of 18428405821 is 12850482481.

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

It is not a de Polignac number, because 18428405821 - 2³ = 18428405813 is a prime.

It is a super-2 number, since 2×18428405821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428400821) 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, 7607545 + ... + 7609966.

It is an arithmetic number, because the mean of its divisors is an integer number (2647847088).

Almost surely, 2^18428405821 is an apocalyptic number.

It is an amenable number.

18428405821 is a deficient number, since it is larger than the sum of its proper divisors (2754370883).

18428405821 is a wasteful number, since it uses less digits than its factorization.

18428405821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15217691.

The product of its (nonzero) digits is 163840, while the sum is 43.

The spelling of 18428405821 in words is "eighteen billion, four hundred twenty-eight million, four hundred five thousand, eight hundred twenty-one".