20210212121 has 16 divisors (see below), whose sum is σ = 22484226240. Its totient is φ = 18009625920.

The previous prime is 20210212117. The next prime is 20210212147. The reversal of 20210212121 is 12121201202.

It is not a de Polignac number, because 20210212121 - 2² = 20210212117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210212096 and 20210212105.

It is not an unprimeable number, because it can be changed into a prime (20210212151) 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 15 ways as a sum of consecutive naturals, for example, 639275 + ... + 670143.

It is an arithmetic number, because the mean of its divisors is an integer number (1405264140).

Almost surely, 2^20210212121 is an apocalyptic number.

It is an amenable number.

20210212121 is a deficient number, since it is larger than the sum of its proper divisors (2274014119).

20210212121 is a wasteful number, since it uses less digits than its factorization.

20210212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32056.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20210212121 its reverse (12121201202), we get a palindrome (32331413323).

The spelling of 20210212121 in words is "twenty billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".