21106449055893 has 8 divisors (see below), whose sum is σ = 28142362516000. Its totient is φ = 14070750816528.

The previous prime is 21106449055883. The next prime is 21106449055921. The reversal of 21106449055893 is 39855094460112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21106449055893 - 2⁹ = 21106449055381 is a prime.

It is a super-2 number, since 2×21106449055893² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106449055883) 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, 53576218 + ... + 53968731.

It is an arithmetic number, because the mean of its divisors is an integer number (3517795314500).

Almost surely, 2^{21106449055893} is an apocalyptic number.

It is an amenable number.

21106449055893 is a deficient number, since it is larger than the sum of its proper divisors (7035913460107).

21106449055893 is a wasteful number, since it uses less digits than its factorization.

21106449055893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107610371.

The product of its (nonzero) digits is 9331200, while the sum is 57.

The spelling of 21106449055893 in words is "twenty-one trillion, one hundred six billion, four hundred forty-nine million, fifty-five thousand, eight hundred ninety-three".