21500443045020 has 48 divisors (see below), whose sum is σ = 60201927475200. Its totient is φ = 5733386054976.

The previous prime is 21500443044989. The next prime is 21500443045043. The reversal of 21500443045020 is 2054034400512.

It is a super-2 number, since 2×21500443045020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3376249 + ... + 7375631.

It is an arithmetic number, because the mean of its divisors is an integer number (1254206822400).

Almost surely, 2^{21500443045020} is an apocalyptic number.

21500443045020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21500443045020 is an abundant number, since it is smaller than the sum of its proper divisors (38701484430180).

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

21500443045020 is a wasteful number, since it uses less digits than its factorization.

21500443045020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088994 (or 4088992 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21500443045020 its reverse (2054034400512), we get a palindrome (23554477445532).

The spelling of 21500443045020 in words is "twenty-one trillion, five hundred billion, four hundred forty-three million, forty-five thousand, twenty".