21371194549 has 8 divisors (see below), whose sum is σ = 21959809920. Its totient is φ = 20788158816.

The previous prime is 21371194541. The next prime is 21371194553. The reversal of 21371194549 is 94549117312.

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 21371194549 - 2³ = 21371194541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21371194499 and 21371194508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371194541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1387144 + ... + 1402465.

It is an arithmetic number, because the mean of its divisors is an integer number (2744976240).

Almost surely, 2^21371194549 is an apocalyptic number.

It is an amenable number.

21371194549 is a deficient number, since it is larger than the sum of its proper divisors (588615371).

21371194549 is a wasteful number, since it uses less digits than its factorization.

21371194549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789819.

The product of its digits is 272160, while the sum is 46.

The spelling of 21371194549 in words is "twenty-one billion, three hundred seventy-one million, one hundred ninety-four thousand, five hundred forty-nine".