21038434328 has 32 divisors (see below), whose sum is σ = 41333038560. Its totient is φ = 10020088320.

The previous prime is 21038434327. The next prime is 21038434381. The reversal of 21038434328 is 82343483012.

It is a junction number, because it is equal to n+sod(n) for n = 21038434291 and 21038434300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038434327) 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, 192875 + ... + 281562.

It is an arithmetic number, because the mean of its divisors is an integer number (1291657455).

Almost surely, 2^21038434328 is an apocalyptic number.

It is an amenable number.

21038434328 is a deficient number, since it is larger than the sum of its proper divisors (20294604232).

21038434328 is a wasteful number, since it uses less digits than its factorization.

21038434328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474707 (or 474703 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 21038434328 in words is "twenty-one billion, thirty-eight million, four hundred thirty-four thousand, three hundred twenty-eight".