21143245012000 has 48 divisors (see below), whose sum is σ = 51948953004312. Its totient is φ = 8457298003200.

The previous prime is 21143245011989. The next prime is 21143245012037. The reversal of 21143245012000 is 21054234112.

It can be written as a sum of positive squares in 4 ways, for example, as 11223491621904 + 9919753390096 = 3350148^2 + 3149564^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

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 7 ways as a sum of consecutive naturals, for example, 2642901627 + ... + 2642909626.

Almost surely, 2^{21143245012000} is an apocalyptic number.

21143245012000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143245012000 is an abundant number, since it is smaller than the sum of its proper divisors (30805707992312).

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

21143245012000 is an equidigital number, since it uses as much as digits as its factorization.

21143245012000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5285811278 (or 5285811260 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21143245012000 its reverse (21054234112), we get a palindrome (21164299246112).

The spelling of 21143245012000 in words is "twenty-one trillion, one hundred forty-three billion, two hundred forty-five million, twelve thousand".