21033420400 has 30 divisors (see below), whose sum is σ = 50532793472. Its totient is φ = 8413368000.

The previous prime is 21033420389. The next prime is 21033420439. The reversal of 21033420400 is 402433012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26291376 + ... + 26292175.

Almost surely, 2^21033420400 is an apocalyptic number.

21033420400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033420400 is an abundant number, since it is smaller than the sum of its proper divisors (29499373072).

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

21033420400 is a wasteful number, since it uses less digits than its factorization.

21033420400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52583569 (or 52583558 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21033420400 its reverse (402433012), we get a palindrome (21435853412).

The spelling of 21033420400 in words is "twenty-one billion, thirty-three million, four hundred twenty thousand, four hundred".