21033203400 has 288 divisors, whose sum is σ = 77246395200. Its totient is φ = 5086502400.

The previous prime is 21033203383. The next prime is 21033203431. The reversal of 21033203400 is 430233012.

21033203400 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 320 + 340 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10077157 + ... + 10079243.

It is an arithmetic number, because the mean of its divisors is an integer number (268216650).

Almost surely, 2^21033203400 is an apocalyptic number.

21033203400 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 21033203400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38623197600).

21033203400 is an abundant number, since it is smaller than the sum of its proper divisors (56213191800).

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

21033203400 is a wasteful number, since it uses less digits than its factorization.

21033203400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629 (or 2617 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21033203400 its reverse (430233012), we get a palindrome (21463436412).

The spelling of 21033203400 in words is "twenty-one billion, thirty-three million, two hundred three thousand, four hundred".