21535331409430 has 16 divisors (see below), whose sum is σ = 39230627822064. Its totient is φ = 8510347833760.

The previous prime is 21535331409377. The next prime is 21535331409433. The reversal of 21535331409430 is 3490413353512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535331409433) 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 7 ways as a sum of consecutive naturals, for example, 12973090381 + ... + 12973092040.

It is an arithmetic number, because the mean of its divisors is an integer number (2451914238879).

Almost surely, 2^{21535331409430} is an apocalyptic number.

21535331409430 is a deficient number, since it is larger than the sum of its proper divisors (17695296412634).

21535331409430 is a wasteful number, since it uses less digits than its factorization.

21535331409430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25946182511.

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 21535331409430 in words is "twenty-one trillion, five hundred thirty-five billion, three hundred thirty-one million, four hundred nine thousand, four hundred thirty".