428148783421 has 4 divisors (see below), whose sum is σ = 428488855200. Its totient is φ = 427808711644.

The previous prime is 428148783353. The next prime is 428148783467. The reversal of 428148783421 is 124387841824.

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.

It is a cyclic number.

It is not a de Polignac number, because 428148783421 - 2²¹ = 428146686269 is a prime.

It is a super-2 number, since 2×428148783421² (a number of 24 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 (428158783421) 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, 170034001 + ... + 170036518.

It is an arithmetic number, because the mean of its divisors is an integer number (107122213800).

Almost surely, 2^428148783421 is an apocalyptic number.

It is an amenable number.

428148783421 is a deficient number, since it is larger than the sum of its proper divisors (340071779).

428148783421 is a wasteful number, since it uses less digits than its factorization.

428148783421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340071778.

The product of its digits is 2752512, while the sum is 52.

The spelling of 428148783421 in words is "four hundred twenty-eight billion, one hundred forty-eight million, seven hundred eighty-three thousand, four hundred twenty-one".