21329158938 has 16 divisors (see below), whose sum is σ = 43056995040. Its totient is φ = 7043273456.

The previous prime is 21329158937. The next prime is 21329158969. The reversal of 21329158938 is 83985192312.

It is a super-3 number, since 3×21329158938³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21329158937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16610853 + ... + 16612136.

It is an arithmetic number, because the mean of its divisors is an integer number (2691062190).

Almost surely, 2^21329158938 is an apocalyptic number.

21329158938 is an abundant number, since it is smaller than the sum of its proper divisors (21727836102).

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

21329158938 is a wasteful number, since it uses less digits than its factorization.

21329158938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33223101.

The product of its digits is 933120, while the sum is 51.

The spelling of 21329158938 in words is "twenty-one billion, three hundred twenty-nine million, one hundred fifty-eight thousand, nine hundred thirty-eight".