21012521035000 has 80 divisors (see below), whose sum is σ = 53708003906040. Its totient is φ = 7640916720000.

The previous prime is 21012521034971. The next prime is 21012521035007. The reversal of 21012521035000 is 53012521012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012521035007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 190967919 + ... + 191077918.

Almost surely, 2^{21012521035000} is an apocalyptic number.

21012521035000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012521035000 is an abundant number, since it is smaller than the sum of its proper divisors (32695482871040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012521035000 is a wasteful number, since it uses less digits than its factorization.

21012521035000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382045874 (or 382045855 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 21012521035000 its reverse (53012521012), we get a palindrome (21065533556012).

The spelling of 21012521035000 in words is "twenty-one trillion, twelve billion, five hundred twenty-one million, thirty-five thousand".