21283628129 has 2 divisors, whose sum is σ = 21283628130. Its totient is φ = 21283628128.

The previous prime is 21283628123. The next prime is 21283628137. The reversal of 21283628129 is 92182638212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20282032225 + 1001595904 = 142415^2 + 31648^2 .

It is a cyclic number.

It is not a de Polignac number, because 21283628129 - 2¹⁶ = 21283562593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21283628129.

It is not a weakly prime, because it can be changed into another prime (21283628123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641814064 + 10641814065.

It is an arithmetic number, because the mean of its divisors is an integer number (10641814065).

Almost surely, 2^21283628129 is an apocalyptic number.

It is an amenable number.

21283628129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21283628129 is an equidigital number, since it uses as much as digits as its factorization.

21283628129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The spelling of 21283628129 in words is "twenty-one billion, two hundred eighty-three million, six hundred twenty-eight thousand, one hundred twenty-nine".