21404350505030 has 32 divisors (see below), whose sum is σ = 38844472942080. Its totient is φ = 8491641338880.

The previous prime is 21404350505029. The next prime is 21404350505039. The reversal of 21404350505030 is 3050505340412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404350505039) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15983135 + ... + 17270474.

It is an arithmetic number, because the mean of its divisors is an integer number (1213889779440).

Almost surely, 2^{21404350505030} is an apocalyptic number.

21404350505030 is a deficient number, since it is larger than the sum of its proper divisors (17440122437050).

21404350505030 is a wasteful number, since it uses less digits than its factorization.

21404350505030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33254144.

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 21404350505030 its reverse (3050505340412), we get a palindrome (24454855845442).

The spelling of 21404350505030 in words is "twenty-one trillion, four hundred four billion, three hundred fifty million, five hundred five thousand, thirty".