21052579894 has 8 divisors (see below), whose sum is σ = 31589985960. Its totient is φ = 10522584576.

The previous prime is 21052579831. The next prime is 21052579897. The reversal of 21052579894 is 49897525012.

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

It is a super-3 number, since 3×21052579894³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 3 ways as a sum of consecutive naturals, for example, 1845579 + ... + 1856950.

It is an arithmetic number, because the mean of its divisors is an integer number (3948748245).

Almost surely, 2^21052579894 is an apocalyptic number.

21052579894 is a deficient number, since it is larger than the sum of its proper divisors (10537406066).

21052579894 is a wasteful number, since it uses less digits than its factorization.

21052579894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705374.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 21052579894 in words is "twenty-one billion, fifty-two million, five hundred seventy-nine thousand, eight hundred ninety-four".