21428338334 has 16 divisors (see below), whose sum is σ = 34628147568. Its totient is φ = 9886248192.

The previous prime is 21428338319. The next prime is 21428338417. The reversal of 21428338334 is 43383382412.

It is a junction number, because it is equal to n+sod(n) for n = 21428338291 and 21428338300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86012 + ... + 224175.

It is an arithmetic number, because the mean of its divisors is an integer number (2164259223).

Almost surely, 2^21428338334 is an apocalyptic number.

21428338334 is a deficient number, since it is larger than the sum of its proper divisors (13199809234).

21428338334 is a wasteful number, since it uses less digits than its factorization.

21428338334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312859.

The product of its digits is 331776, while the sum is 41.

The spelling of 21428338334 in words is "twenty-one billion, four hundred twenty-eight million, three hundred thirty-eight thousand, three hundred thirty-four".