21151421200 has 240 divisors, whose sum is σ = 63305698176. Its totient is φ = 6612480000.

The previous prime is 21151421191. The next prime is 21151421201. The reversal of 21151421200 is 212415112.

It is not an unprimeable number, because it can be changed into a prime (21151421201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3017700 + ... + 3024700.

Almost surely, 2^21151421200 is an apocalyptic number.

21151421200 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 21151421200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31652849088).

21151421200 is an abundant number, since it is smaller than the sum of its proper divisors (42154276976).

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

21151421200 is a wasteful number, since it uses less digits than its factorization.

21151421200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7122 (or 7111 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21151421200 its reverse (212415112), we get a palindrome (21363836312).

The spelling of 21151421200 in words is "twenty-one billion, one hundred fifty-one million, four hundred twenty-one thousand, two hundred".