20122121093909 has 2 divisors, whose sum is σ = 20122121093910. Its totient is φ = 20122121093908.

The previous prime is 20122121093861. The next prime is 20122121093989. The reversal of 20122121093909 is 90939012122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18570738746884 + 1551382347025 = 4309378^2 + 1245545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122121093909 - 2²⁴ = 20122104316693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122121093989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061060546954 + 10061060546955.

It is an arithmetic number, because the mean of its divisors is an integer number (10061060546955).

Almost surely, 2^{20122121093909} is an apocalyptic number.

It is an amenable number.

20122121093909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122121093909 is an equidigital number, since it uses as much as digits as its factorization.

20122121093909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 20122121093909 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-one million, ninety-three thousand, nine hundred nine".