20212121211 has 8 divisors (see below), whose sum is σ = 26952025104. Its totient is φ = 13473482400.

The previous prime is 20212121201. The next prime is 20212121227. The reversal of 20212121211 is 11212121202.

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

It is not a de Polignac number, because 20212121211 - 2¹¹ = 20212119163 is a prime.

It is a super-2 number, since 2×20212121211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20212121201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278340 + ... + 343361.

It is an arithmetic number, because the mean of its divisors is an integer number (3369003138).

Almost surely, 2^20212121211 is an apocalyptic number.

20212121211 is a deficient number, since it is larger than the sum of its proper divisors (6739903893).

20212121211 is a wasteful number, since it uses less digits than its factorization.

20212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632541.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20212121211 its reverse (11212121202), we get a palindrome (31424242413).

Subtracting from 20212121211 its reverse (11212121202), we obtain a palindrome (9000000009).

The spelling of 20212121211 in words is "twenty billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".