20210121001209 has 32 divisors (see below), whose sum is σ = 28868477440000. Its totient is φ = 12539382920064.

The previous prime is 20210121001181. The next prime is 20210121001219. The reversal of 20210121001209 is 90210012101202.

It is not a de Polignac number, because 20210121001209 - 2¹⁹ = 20210120476921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210121001219) 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 in 31 ways as a sum of consecutive naturals, for example, 10380652 + ... + 12172845.

It is an arithmetic number, because the mean of its divisors is an integer number (902139920000).

Almost surely, 2^{20210121001209} is an apocalyptic number.

It is an amenable number.

20210121001209 is a deficient number, since it is larger than the sum of its proper divisors (8658356438791).

20210121001209 is a wasteful number, since it uses less digits than its factorization.

20210121001209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22553797.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 20210121001209 in words is "twenty trillion, two hundred ten billion, one hundred twenty-one million, one thousand, two hundred nine".