2100043400400 has 480 divisors, whose sum is σ = 8508645411840. Its totient is φ = 486965952000.

The previous prime is 2100043400347. The next prime is 2100043400447. The reversal of 2100043400400 is 40043400012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2348115 + ... + 3116685.

It is an arithmetic number, because the mean of its divisors is an integer number (17726344608).

Almost surely, 2^{2100043400400} is an apocalyptic number.

2100043400400 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 2100043400400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4254322705920).

2100043400400 is an abundant number, since it is smaller than the sum of its proper divisors (6408602011440).

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

2100043400400 is a wasteful number, since it uses less digits than its factorization.

2100043400400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768632 (or 768615 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 2100043400400 its reverse (40043400012), we get a palindrome (2140086800412).

The spelling of 2100043400400 in words is "two trillion, one hundred billion, forty-three million, four hundred thousand, four hundred".