21043525052 has 24 divisors (see below), whose sum is σ = 40180396032. Its totient is φ = 9563716400.

The previous prime is 21043525049. The next prime is 21043525057. The reversal of 21043525052 is 25052534012.

It is a super-2 number, since 2×21043525052² (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 (21043525057) 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, 269483 + ... + 338685.

It is an arithmetic number, because the mean of its divisors is an integer number (1674183168).

Almost surely, 2^21043525052 is an apocalyptic number.

21043525052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21043525052 is a deficient number, since it is larger than the sum of its proper divisors (19136870980).

21043525052 is a wasteful number, since it uses less digits than its factorization.

21043525052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76129 (or 76127 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The spelling of 21043525052 in words is "twenty-one billion, forty-three million, five hundred twenty-five thousand, fifty-two".