21250042552 has 32 divisors (see below), whose sum is σ = 41241600000. Its totient is φ = 10252706688.

The previous prime is 21250042549. The next prime is 21250042553. The reversal of 21250042552 is 25524005212.

It is a super-3 number, since 3×21250042552³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21250042552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250042553) 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, 389449 + ... + 440647.

It is an arithmetic number, because the mean of its divisors is an integer number (1288800000).

Almost surely, 2^21250042552 is an apocalyptic number.

It is an amenable number.

21250042552 is a deficient number, since it is larger than the sum of its proper divisors (19991557448).

21250042552 is a wasteful number, since it uses less digits than its factorization.

21250042552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53023 (or 53019 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

Adding to 21250042552 its reverse (25524005212), we get a palindrome (46774047764).

The spelling of 21250042552 in words is "twenty-one billion, two hundred fifty million, forty-two thousand, five hundred fifty-two".