21438603143287 has 4 divisors (see below), whose sum is σ = 23387567065416. Its totient is φ = 19489639221160.

The previous prime is 21438603143257. The next prime is 21438603143311. The reversal of 21438603143287 is 78234130683412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21438603143287 - 2³⁵ = 21404243404919 is a prime.

It is a super-2 number, since 2×21438603143287² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438603143227) 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, 974481961048 + ... + 974481961069.

It is an arithmetic number, because the mean of its divisors is an integer number (5846891766354).

Almost surely, 2^{21438603143287} is an apocalyptic number.

21438603143287 is a deficient number, since it is larger than the sum of its proper divisors (1948963922129).

21438603143287 is a wasteful number, since it uses less digits than its factorization.

21438603143287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948963922128.

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 21438603143287 in words is "twenty-one trillion, four hundred thirty-eight billion, six hundred three million, one hundred forty-three thousand, two hundred eighty-seven".