21898203805400 has 192 divisors, whose sum is σ = 54989203903200. Its totient is φ = 8061993308160.

The previous prime is 21898203805349. The next prime is 21898203805451. The reversal of 21898203805400 is 450830289812.

It is an interprime number because it is at equal distance from previous prime (21898203805349) and next prime (21898203805451).

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3533675102 + ... + 3533681298.

Almost surely, 2^{21898203805400} is an apocalyptic number.

21898203805400 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 21898203805400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27494601951600).

21898203805400 is an abundant number, since it is smaller than the sum of its proper divisors (33091000097800).

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

21898203805400 is a wasteful number, since it uses less digits than its factorization.

21898203805400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9958 (or 9949 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 21898203805400 in words is "twenty-one trillion, eight hundred ninety-eight billion, two hundred three million, eight hundred five thousand, four hundred".