21603747001206 has 128 divisors (see below), whose sum is σ = 45196704000000. Its totient is φ = 6878866176000.

The previous prime is 21603747001121. The next prime is 21603747001211. The reversal of 21603747001206 is 60210074730612.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1152251920 + ... + 1152270668.

It is an arithmetic number, because the mean of its divisors is an integer number (353099250000).

Almost surely, 2^{21603747001206} is an apocalyptic number.

21603747001206 is an abundant number, since it is smaller than the sum of its proper divisors (23592956998794).

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

21603747001206 is a wasteful number, since it uses less digits than its factorization.

21603747001206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19366.

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 21603747001206 in words is "twenty-one trillion, six hundred three billion, seven hundred forty-seven million, one thousand, two hundred six".