20200212121 has 4 divisors (see below), whose sum is σ = 21263381200. Its totient is φ = 19137043044.

The previous prime is 20200211947. The next prime is 20200212127. The reversal of 20200212121 is 12121200202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20200212121 - 2¹⁵ = 20200179353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20200212127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531584511 + ... + 531584548.

It is an arithmetic number, because the mean of its divisors is an integer number (5315845300).

Almost surely, 2^20200212121 is an apocalyptic number.

It is an amenable number.

20200212121 is a deficient number, since it is larger than the sum of its proper divisors (1063169079).

20200212121 is a wasteful number, since it uses less digits than its factorization.

20200212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063169078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20200212121 its reverse (12121200202), we get a palindrome (32321412323).

The spelling of 20200212121 in words is "twenty billion, two hundred million, two hundred twelve thousand, one hundred twenty-one".