20201210121 has 8 divisors (see below), whose sum is σ = 27237587040. Its totient is φ = 13316153312.

The previous prime is 20201210111. The next prime is 20201210129. The reversal of 20201210121 is 12101210202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20201210121 - 2²³ = 20192821513 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20201210097 and 20201210106.

It is not an unprimeable number, because it can be changed into a prime (20201210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37829715 + ... + 37830248.

It is an arithmetic number, because the mean of its divisors is an integer number (3404698380).

Almost surely, 2^20201210121 is an apocalyptic number.

It is an amenable number.

20201210121 is a deficient number, since it is larger than the sum of its proper divisors (7036376919).

20201210121 is an equidigital number, since it uses as much as digits as its factorization.

20201210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75660055.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20201210121 its reverse (12101210202), we get a palindrome (32302420323).

The spelling of 20201210121 in words is "twenty billion, two hundred one million, two hundred ten thousand, one hundred twenty-one".