21256334710138 has 8 divisors (see below), whose sum is σ = 34783093162080. Its totient is φ = 9661970322780.

The previous prime is 21256334710133. The next prime is 21256334710201. The reversal of 21256334710138 is 83101743365212.

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

It is not an unprimeable number, because it can be changed into a prime (21256334710133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483098516118 + ... + 483098516161.

It is an arithmetic number, because the mean of its divisors is an integer number (4347886645260).

Almost surely, 2^{21256334710138} is an apocalyptic number.

21256334710138 is a deficient number, since it is larger than the sum of its proper divisors (13526758451942).

21256334710138 is a wasteful number, since it uses less digits than its factorization.

21256334710138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966197032292.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 21256334710138 in words is "twenty-one trillion, two hundred fifty-six billion, three hundred thirty-four million, seven hundred ten thousand, one hundred thirty-eight".