21723755614129 has 2 divisors, whose sum is σ = 21723755614130. Its totient is φ = 21723755614128.

The previous prime is 21723755614063. The next prime is 21723755614159. The reversal of 21723755614129 is 92141655732712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13724446441104 + 7999309173025 = 3704652^2 + 2828305^2 .

It is a cyclic number.

It is not a de Polignac number, because 21723755614129 - 2¹¹ = 21723755612081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21723755614129.

It is not a weakly prime, because it can be changed into another prime (21723755614159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10861877807064 + 10861877807065.

It is an arithmetic number, because the mean of its divisors is an integer number (10861877807065).

Almost surely, 2^{21723755614129} is an apocalyptic number.

It is an amenable number.

21723755614129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21723755614129 is an equidigital number, since it uses as much as digits as its factorization.

21723755614129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6350400, while the sum is 55.

The spelling of 21723755614129 in words is "twenty-one trillion, seven hundred twenty-three billion, seven hundred fifty-five million, six hundred fourteen thousand, one hundred twenty-nine".