21013412138 has 8 divisors (see below), whose sum is σ = 31541905632. Its totient is φ = 10499443596.

The previous prime is 21013412137. The next prime is 21013412201. The reversal of 21013412138 is 83121431012.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21013412137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3627620 + ... + 3633407.

It is an arithmetic number, because the mean of its divisors is an integer number (3942738204).

Almost surely, 2^21013412138 is an apocalyptic number.

21013412138 is a deficient number, since it is larger than the sum of its proper divisors (10528493494).

21013412138 is a wasteful number, since it uses less digits than its factorization.

21013412138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7262476.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 21013412138 in words is "twenty-one billion, thirteen million, four hundred twelve thousand, one hundred thirty-eight".