21201200005129 has 2 divisors, whose sum is σ = 21201200005130. Its totient is φ = 21201200005128.

The previous prime is 21201200005123. The next prime is 21201200005147. The reversal of 21201200005129 is 92150000210212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14399353443904 + 6801846561225 = 3794648^2 + 2608035^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201200005129 - 2²⁵ = 21201166450697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201200005123) 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, 10600600002564 + 10600600002565.

It is an arithmetic number, because the mean of its divisors is an integer number (10600600002565).

Almost surely, 2^{21201200005129} is an apocalyptic number.

It is an amenable number.

21201200005129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201200005129 is an equidigital number, since it uses as much as digits as its factorization.

21201200005129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 21201200005129 in words is "twenty-one trillion, two hundred one billion, two hundred million, five thousand, one hundred twenty-nine".