21215100104200 has 192 divisors, whose sum is σ = 50616560332800. Its totient is φ = 8265674937600.

The previous prime is 21215100104197. The next prime is 21215100104221. The reversal of 21215100104200 is 240100151212.

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, 1994082481 + ... + 1994093119.

It is an arithmetic number, because the mean of its divisors is an integer number (263627918400).

Almost surely, 2^{21215100104200} is an apocalyptic number.

21215100104200 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 21215100104200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25308280166400).

21215100104200 is an abundant number, since it is smaller than the sum of its proper divisors (29401460228600).

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

21215100104200 is a wasteful number, since it uses less digits than its factorization.

21215100104200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11700 (or 11691 counting only the distinct ones).

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

Adding to 21215100104200 its reverse (240100151212), we get a palindrome (21455200255412).

The spelling of 21215100104200 in words is "twenty-one trillion, two hundred fifteen billion, one hundred million, one hundred four thousand, two hundred".