21531424435202 has 16 divisors (see below), whose sum is σ = 35234913657024. Its totient is φ = 9786546198000.

The previous prime is 21531424435151. The next prime is 21531424435273. The reversal of 21531424435202 is 20253442413512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22771574 + ... + 23698257.

It is an arithmetic number, because the mean of its divisors is an integer number (2202182103564).

Almost surely, 2^{21531424435202} is an apocalyptic number.

21531424435202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21531424435202 is a deficient number, since it is larger than the sum of its proper divisors (13703489221822).

21531424435202 is a wasteful number, since it uses less digits than its factorization.

21531424435202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46490905.

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 21531424435202 its reverse (20253442413512), we get a palindrome (41784866848714).

The spelling of 21531424435202 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred twenty-four million, four hundred thirty-five thousand, two hundred two".