21210531200 has 96 divisors (see below), whose sum is σ = 53813066160. Its totient is φ = 8254863360.

The previous prime is 21210531157. The next prime is 21210531263. The reversal of 21210531200 is 213501212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28829 + ... + 207971.

Almost surely, 2^21210531200 is an apocalyptic number.

21210531200 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 21210531200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26906533080).

21210531200 is an abundant number, since it is smaller than the sum of its proper divisors (32602534960).

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

21210531200 is a wasteful number, since it uses less digits than its factorization.

21210531200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179204 (or 179187 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The spelling of 21210531200 in words is "twenty-one billion, two hundred ten million, five hundred thirty-one thousand, two hundred".