21624025326121 has 4 divisors (see below), whose sum is σ = 21978517544644. Its totient is φ = 21269533107600.

The previous prime is 21624025326017. The next prime is 21624025326143. The reversal of 21624025326121 is 12162352042612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 703692810496 + 20920332515625 = 838864^2 + 4573875^2 .

It is a cyclic number.

It is not a de Polignac number, because 21624025326121 - 2¹¹ = 21624025324073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21624025326221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177246109170 + ... + 177246109291.

It is an arithmetic number, because the mean of its divisors is an integer number (5494629386161).

Almost surely, 2^{21624025326121} is an apocalyptic number.

It is an amenable number.

21624025326121 is a deficient number, since it is larger than the sum of its proper divisors (354492218523).

21624025326121 is an equidigital number, since it uses as much as digits as its factorization.

21624025326121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354492218522.

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21624025326121 its reverse (12162352042612), we get a palindrome (33786377368733).

The spelling of 21624025326121 in words is "twenty-one trillion, six hundred twenty-four billion, twenty-five million, three hundred twenty-six thousand, one hundred twenty-one".