21428134842 has 16 divisors (see below), whose sum is σ = 42859266912. Its totient is φ = 7142212080.

The previous prime is 21428134801. The next prime is 21428134873. The reversal of 21428134842 is 24843182412.

It is a self number, because there is not a number n which added to its sum of digits gives 21428134842.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25909 + ... + 208632.

It is an arithmetic number, because the mean of its divisors is an integer number (2678704182).

Almost surely, 2^21428134842 is an apocalyptic number.

21428134842 is an abundant number, since it is smaller than the sum of its proper divisors (21431132070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21428134842 is a wasteful number, since it uses less digits than its factorization.

21428134842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249773.

The product of its digits is 98304, while the sum is 39.

The spelling of 21428134842 in words is "twenty-one billion, four hundred twenty-eight million, one hundred thirty-four thousand, eight hundred forty-two".