21010162800 has 240 divisors, whose sum is σ = 73638001152. Its totient is φ = 5078323200.

The previous prime is 21010162763. The next prime is 21010162813. The reversal of 21010162800 is 826101012.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4842232 + ... + 4846568.

Almost surely, 2^21010162800 is an apocalyptic number.

21010162800 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 21010162800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36819000576).

21010162800 is an abundant number, since it is smaller than the sum of its proper divisors (52627838352).

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

21010162800 is a wasteful number, since it uses less digits than its factorization.

21010162800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736 (or 4725 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21010162800 its reverse (826101012), we get a palindrome (21836263812).

The spelling of 21010162800 in words is "twenty-one billion, ten million, one hundred sixty-two thousand, eight hundred".