21020244143439 has 8 divisors (see below), whose sum is σ = 28082055046320. Its totient is φ = 13985964668096.

The previous prime is 21020244143323. The next prime is 21020244143441. The reversal of 21020244143439 is 93434144202012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020244143439 - 2³⁶ = 20951524666703 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020244143397 and 21020244143406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020244143839) 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, 6882855102 + ... + 6882858155.

It is an arithmetic number, because the mean of its divisors is an integer number (3510256880790).

Almost surely, 2^{21020244143439} is an apocalyptic number.

21020244143439 is a deficient number, since it is larger than the sum of its proper divisors (7061810902881).

21020244143439 is a wasteful number, since it uses less digits than its factorization.

21020244143439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13765713769.

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 21020244143439 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-three thousand, four hundred thirty-nine".