21150351200 has 144 divisors (see below), whose sum is σ = 56735743680. Its totient is φ = 7635264000.

The previous prime is 21150351197. The next prime is 21150351217. The reversal of 21150351200 is 215305112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1214555 + ... + 1231845.

It is an arithmetic number, because the mean of its divisors is an integer number (393998220).

Almost surely, 2^21150351200 is an apocalyptic number.

21150351200 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 21150351200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28367871840).

21150351200 is an abundant number, since it is smaller than the sum of its proper divisors (35585392480).

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

21150351200 is a wasteful number, since it uses less digits than its factorization.

21150351200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17461 (or 17448 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 21150351200 its reverse (215305112), we get a palindrome (21365656312).

The spelling of 21150351200 in words is "twenty-one billion, one hundred fifty million, three hundred fifty-one thousand, two hundred".