21623125022117 has 4 divisors (see below), whose sum is σ = 21846043836876. Its totient is φ = 21400206207360.

The previous prime is 21623125022063. The next prime is 21623125022123. The reversal of 21623125022117 is 71122052132612.

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 17231141383681 + 4391983638436 = 4151041^2 + 2095706^2 .

It is a cyclic number.

It is not a de Polignac number, because 21623125022117 - 2¹⁰ = 21623125021093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623125052117) 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, 111459407234 + ... + 111459407427.

It is an arithmetic number, because the mean of its divisors is an integer number (5461510959219).

Almost surely, 2^{21623125022117} is an apocalyptic number.

It is an amenable number.

21623125022117 is a deficient number, since it is larger than the sum of its proper divisors (222918814759).

21623125022117 is an equidigital number, since it uses as much as digits as its factorization.

21623125022117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222918814758.

The product of its (nonzero) digits is 20160, while the sum is 35.

Adding to 21623125022117 its reverse (71122052132612), we get a palindrome (92745177154729).

The spelling of 21623125022117 in words is "twenty-one trillion, six hundred twenty-three billion, one hundred twenty-five million, twenty-two thousand, one hundred seventeen".