20212121201211 has 12 divisors (see below), whose sum is σ = 29213431188760. Its totient is φ = 13466372847840.

The previous prime is 20212121201191. The next prime is 20212121201213. The reversal of 20212121201211 is 11210212121202.

20212121201211 is a `hidden beast` number, since 20 + 21 + 212 + 1 + 201 + 211 = 666.

It is not a de Polignac number, because 20212121201211 - 2³⁰ = 20211047459387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212121201213) 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 11 ways as a sum of consecutive naturals, for example, 697869685 + ... + 697898646.

Almost surely, 2^{20212121201211} is an apocalyptic number.

20212121201211 is a deficient number, since it is larger than the sum of its proper divisors (9001309987549).

20212121201211 is a wasteful number, since it uses less digits than its factorization.

20212121201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395769946 (or 1395769943 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20212121201211 its reverse (11210212121202), we get a palindrome (31422333322413).

The spelling of 20212121201211 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, two hundred one thousand, two hundred eleven".