211520129 has 2 divisors, whose sum is σ = 211520130. Its totient is φ = 211520128.

The previous prime is 211520081. The next prime is 211520131. The reversal of 211520129 is 921025112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210250000 + 1270129 = 14500^2 + 1127^2 .

It is a cyclic number.

It is not a de Polignac number, because 211520129 - 2¹² = 211516033 is a prime.

Together with 211520131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211520149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105760064 + 105760065.

It is an arithmetic number, because the mean of its divisors is an integer number (105760065).

Almost surely, 2^211520129 is an apocalyptic number.

It is an amenable number.

211520129 is a deficient number, since it is larger than the sum of its proper divisors (1).

211520129 is an equidigital number, since it uses as much as digits as its factorization.

211520129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 211520129 is about 14543.7316050593. The cubic root of 211520129 is about 595.8229593295.

The spelling of 211520129 in words is "two hundred eleven million, five hundred twenty thousand, one hundred twenty-nine".