21210054000 has 80 divisors (see below), whose sum is σ = 68381233440. Its totient is φ = 5656012800.

The previous prime is 21210053999. The next prime is 21210054007. The reversal of 21210054000 is 45001212.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210054007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1761505 + ... + 1773504.

It is an arithmetic number, because the mean of its divisors is an integer number (854765418).

Almost surely, 2^21210054000 is an apocalyptic number.

21210054000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210054000 is an abundant number, since it is smaller than the sum of its proper divisors (47171179440).

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

21210054000 is a wasteful number, since it uses less digits than its factorization.

21210054000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535035 (or 3535019 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21210054000 its reverse (45001212), we get a palindrome (21255055212).

The spelling of 21210054000 in words is "twenty-one billion, two hundred ten million, fifty-four thousand".