129202921 has 2 divisors, whose sum is σ = 129202922. Its totient is φ = 129202920.

The previous prime is 129202901. The next prime is 129202951.

129202921 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89965225 + 39237696 = 9485^2 + 6264^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129202921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129202921.

It is not a weakly prime, because it can be changed into another prime (129202901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64601460 + 64601461.

It is an arithmetic number, because the mean of its divisors is an integer number (64601461).

Almost surely, 2^129202921 is an apocalyptic number.

It is an amenable number.

129202921 is a deficient number, since it is larger than the sum of its proper divisors (1).

129202921 is an equidigital number, since it uses as much as digits as its factorization.

129202921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 129202921 is about 11366.7462802686. The cubic root of 129202921 is about 505.5422349471.

The spelling of 129202921 in words is "one hundred twenty-nine million, two hundred two thousand, nine hundred twenty-one".