21213543315000 has 160 divisors (see below), whose sum is σ = 66480181344720. Its totient is φ = 5639098368000.

The previous prime is 21213543314923. The next prime is 21213543315053. The reversal of 21213543315000 is 51334531212.

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 39 ways as a sum of consecutive naturals, for example, 2524344 + ... + 6985656.

Almost surely, 2^{21213543315000} is an apocalyptic number.

21213543315000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213543315000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33240090672360).

21213543315000 is an abundant number, since it is smaller than the sum of its proper divisors (45266638029720).

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

21213543315000 is a wasteful number, since it uses less digits than its factorization.

21213543315000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461659 (or 4461640 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21213543315000 its reverse (51334531212), we get a palindrome (21264877846212).

The spelling of 21213543315000 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifteen thousand".