21000980129 has 2 divisors, whose sum is σ = 21000980130. Its totient is φ = 21000980128.

The previous prime is 21000980113. The next prime is 21000980167. The reversal of 21000980129 is 92108900012.

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., 20569296400 + 431683729 = 143420^2 + 20777^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000980129 - 2⁴ = 21000980113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000980095 and 21000980104.

It is not a weakly prime, because it can be changed into another prime (21000980029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500490064 + 10500490065.

It is an arithmetic number, because the mean of its divisors is an integer number (10500490065).

Almost surely, 2^21000980129 is an apocalyptic number.

It is an amenable number.

21000980129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000980129 is an equidigital number, since it uses as much as digits as its factorization.

21000980129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 21000980129 in words is "twenty-one billion, nine hundred eighty thousand, one hundred twenty-nine".