21012435552000 has 144 divisors (see below), whose sum is σ = 69792805004832. Its totient is φ = 5603316121600.

The previous prime is 21012435551999. The next prime is 21012435552107. The reversal of 21012435552000 is 25553421012.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109343769 + ... + 109535768.

It is an arithmetic number, because the mean of its divisors is an integer number (484672256978).

Almost surely, 2^{21012435552000} is an apocalyptic number.

21012435552000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012435552000 is an abundant number, since it is smaller than the sum of its proper divisors (48780369452832).

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

21012435552000 is an equidigital number, since it uses as much as digits as its factorization.

21012435552000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218879571 (or 218879547 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21012435552000 its reverse (25553421012), we get a palindrome (21037988973012).

The spelling of 21012435552000 in words is "twenty-one trillion, twelve billion, four hundred thirty-five million, five hundred fifty-two thousand".