21428319734 has 8 divisors (see below), whose sum is σ = 32162485968. Its totient is φ = 10707491080.

The previous prime is 21428319727. The next prime is 21428319769. The reversal of 21428319734 is 43791382412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3330377 + ... + 3336804.

It is an arithmetic number, because the mean of its divisors is an integer number (4020310746).

Almost surely, 2^21428319734 is an apocalyptic number.

21428319734 is a deficient number, since it is larger than the sum of its proper divisors (10734166234).

21428319734 is a wasteful number, since it uses less digits than its factorization.

21428319734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6668790.

The product of its digits is 290304, while the sum is 44.

The spelling of 21428319734 in words is "twenty-one billion, four hundred twenty-eight million, three hundred nineteen thousand, seven hundred thirty-four".