21549783379 has 8 divisors (see below), whose sum is σ = 22052912112. Its totient is φ = 21046744320.

The previous prime is 21549783361. The next prime is 21549783397. The reversal of 21549783379 is 97338794512.

It is an interprime number because it is at equal distance from previous prime (21549783361) and next prime (21549783397).

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 21549783379 - 2¹⁵ = 21549750611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21549783179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922119 + ... + 945199.

It is an arithmetic number, because the mean of its divisors is an integer number (2756614014).

Almost surely, 2^21549783379 is an apocalyptic number.

21549783379 is a deficient number, since it is larger than the sum of its proper divisors (503128733).

21549783379 is a wasteful number, since it uses less digits than its factorization.

21549783379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44837.

The product of its digits is 11430720, while the sum is 58.

The spelling of 21549783379 in words is "twenty-one billion, five hundred forty-nine million, seven hundred eighty-three thousand, three hundred seventy-nine".