21489368773 has 8 divisors (see below), whose sum is σ = 21656882016. Its totient is φ = 21321908400.

The previous prime is 21489368743. The next prime is 21489368777. The reversal of 21489368773 is 37786398412.

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 21489368773 - 2⁵ = 21489368741 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 (21489368777) 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, 1323283 + ... + 1339423.

It is an arithmetic number, because the mean of its divisors is an integer number (2707110252).

Almost surely, 2^21489368773 is an apocalyptic number.

It is an amenable number.

21489368773 is a deficient number, since it is larger than the sum of its proper divisors (167513243).

21489368773 is a wasteful number, since it uses less digits than its factorization.

21489368773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26435.

The product of its digits is 12192768, while the sum is 58.

The spelling of 21489368773 in words is "twenty-one billion, four hundred eighty-nine million, three hundred sixty-eight thousand, seven hundred seventy-three".