21224522542129 has 2 divisors, whose sum is σ = 21224522542130. Its totient is φ = 21224522542128.

The previous prime is 21224522542121. The next prime is 21224522542243. The reversal of 21224522542129 is 92124522542212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14295771950625 + 6928750591504 = 3780975^2 + 2632252^2 .

It is a cyclic number.

It is not a de Polignac number, because 21224522542129 - 2³ = 21224522542121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21224522542121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612261271064 + 10612261271065.

It is an arithmetic number, because the mean of its divisors is an integer number (10612261271065).

Almost surely, 2^{21224522542129} is an apocalyptic number.

It is an amenable number.

21224522542129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224522542129 is an equidigital number, since it uses as much as digits as its factorization.

21224522542129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 460800, while the sum is 43.

The spelling of 21224522542129 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred twenty-two million, five hundred forty-two thousand, one hundred twenty-nine".