21052579893 has 8 divisors (see below), whose sum is σ = 28070794656. Its totient is φ = 14034709200.

The previous prime is 21052579831. The next prime is 21052579897. The reversal of 21052579893 is 39897525012.

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

It is not a de Polignac number, because 21052579893 - 2³⁰ = 19978838069 is a prime.

It is a super-2 number, since 2×21052579893² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052579897) 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, 146703 + ... + 252243.

It is an arithmetic number, because the mean of its divisors is an integer number (3508849332).

Almost surely, 2^21052579893 is an apocalyptic number.

It is an amenable number.

21052579893 is a deficient number, since it is larger than the sum of its proper divisors (7018214763).

21052579893 is a wasteful number, since it uses less digits than its factorization.

21052579893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172035.

The product of its (nonzero) digits is 1360800, while the sum is 51.

The spelling of 21052579893 in words is "twenty-one billion, fifty-two million, five hundred seventy-nine thousand, eight hundred ninety-three".