21282969839 has 4 divisors (see below), whose sum is σ = 21283867920. Its totient is φ = 21282071760.

The previous prime is 21282969797. The next prime is 21282969847. The reversal of 21282969839 is 93896928212.

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 21282969839 - 2¹⁶ = 21282904303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21282969899) 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, 412502 + ... + 461219.

It is an arithmetic number, because the mean of its divisors is an integer number (5320966980).

Almost surely, 2^21282969839 is an apocalyptic number.

21282969839 is a deficient number, since it is larger than the sum of its proper divisors (898081).

21282969839 is an equidigital number, since it uses as much as digits as its factorization.

21282969839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898080.

The product of its digits is 6718464, while the sum is 59.

The spelling of 21282969839 in words is "twenty-one billion, two hundred eighty-two million, nine hundred sixty-nine thousand, eight hundred thirty-nine".