21436224025329 has 9 divisors (see below), whose sum is σ = 30963454766283. Its totient is φ = 14290806757032.

The previous prime is 21436224025301. The next prime is 21436224025339. The reversal of 21436224025329 is 92352042263412.

The square root of 21436224025329 is 4629927.

It is a perfect power (a square), and thus also a powerful number.

21436224025329 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 62 + 240 + 25 + 329 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16429459768929 + 5006764256400 = 4053327^2 + 2237580^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-21436224025329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21436224025339) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13118127 + ... + 14661435.

Almost surely, 2^{21436224025329} is an apocalyptic number.

21436224025329 is the 4629927-th square number.

21436224025329 is the 2314964-th centered octagonal number.

It is an amenable number.

21436224025329 is a deficient number, since it is larger than the sum of its proper divisors (9527230740954).

21436224025329 is an frugal number, since it uses more digits than its factorization.

21436224025329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086624 (or 1543312 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 21436224025329 in words is "twenty-one trillion, four hundred thirty-six billion, two hundred twenty-four million, twenty-five thousand, three hundred twenty-nine".