21149193449 has 8 divisors (see below), whose sum is σ = 21204694080. Its totient is φ = 21093728656.

The previous prime is 21149193407. The next prime is 21149193503. The reversal of 21149193449 is 94439194112.

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 21149193449 - 2¹² = 21149189353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21149193049) 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, 1494284 + ... + 1508370.

It is an arithmetic number, because the mean of its divisors is an integer number (2650586760).

Almost surely, 2^21149193449 is an apocalyptic number.

It is an amenable number.

21149193449 is a deficient number, since it is larger than the sum of its proper divisors (55500631).

21149193449 is a wasteful number, since it uses less digits than its factorization.

21149193449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17919.

The product of its digits is 279936, while the sum is 47.

The spelling of 21149193449 in words is "twenty-one billion, one hundred forty-nine million, one hundred ninety-three thousand, four hundred forty-nine".