21600735577421 has 64 divisors (see below), whose sum is σ = 29730173147136. Its totient is φ = 15148405036800.

The previous prime is 21600735577417. The next prime is 21600735577439. The reversal of 21600735577421 is 12477553700612.

It is not a de Polignac number, because 21600735577421 - 2² = 21600735577417 is a prime.

It is a super-2 number, since 2×21600735577421² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21600735577421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600735577471) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23524466 + ... + 24425436.

It is an arithmetic number, because the mean of its divisors is an integer number (464533955424).

Almost surely, 2^{21600735577421} is an apocalyptic number.

It is an amenable number.

21600735577421 is a deficient number, since it is larger than the sum of its proper divisors (8129437569715).

21600735577421 is a wasteful number, since it uses less digits than its factorization.

21600735577421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901602.

The product of its (nonzero) digits is 2469600, while the sum is 50.

The spelling of 21600735577421 in words is "twenty-one trillion, six hundred billion, seven hundred thirty-five million, five hundred seventy-seven thousand, four hundred twenty-one".