21605357233070 has 16 divisors (see below), whose sum is σ = 41881154021280. Its totient is φ = 7977362670624.

The previous prime is 21605357233037. The next prime is 21605357233087. The reversal of 21605357233070 is 7033275350612.

It is a super-2 number, since 2×21605357233070² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 83097527690 + ... + 83097527949.

It is an arithmetic number, because the mean of its divisors is an integer number (2617572126330).

Almost surely, 2^{21605357233070} is an apocalyptic number.

21605357233070 is a deficient number, since it is larger than the sum of its proper divisors (20275796788210).

21605357233070 is a wasteful number, since it uses less digits than its factorization.

21605357233070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166195055659.

The product of its (nonzero) digits is 793800, while the sum is 44.

The spelling of 21605357233070 in words is "twenty-one trillion, six hundred five billion, three hundred fifty-seven million, two hundred thirty-three thousand, seventy".