1220210129 has 2 divisors, whose sum is σ = 1220210130.
Its totient is φ = 1220210128.
The previous prime is 1220210107. The next prime is 1220210137. The reversal of 1220210129 is 9210120221.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1033751104 + 186459025 = 32152^2 + 13655^2
It is a cyclic number.
It is not a de Polignac number, because 1220210129 - 212 = 1220206033 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 1220210129.
It is not a weakly prime, because it can be changed into another prime (1220210029) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105064 + 610105065.
It is an arithmetic number, because the mean of its divisors is an integer number (610105065).
Almost surely, 21220210129 is an apocalyptic number.
It is an amenable number.
1220210129 is a deficient number, since it is larger than the sum of its proper divisors (1).
1220210129 is an equidigital number, since it uses as much as digits as its factorization.
1220210129 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 144, while the sum is 20.
The square root of 1220210129 is about 34931.5062515203.
The cubic root of 1220210129 is about 1068.5910733713.
The spelling of 1220210129 in words is "one billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-nine".