20121201211 has 4 divisors (see below), whose sum is σ = 20122723000. Its totient is φ = 20119679424.

The previous prime is 20121201209. The next prime is 20121201223. The reversal of 20121201211 is 11210212102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20121201211 - 2¹ = 20121201209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121201191 and 20121201200.

It is not an unprimeable number, because it can be changed into a prime (20121201281) 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, 740886 + ... + 767563.

It is an arithmetic number, because the mean of its divisors is an integer number (5030680750).

Almost surely, 2^20121201211 is an apocalyptic number.

20121201211 is a deficient number, since it is larger than the sum of its proper divisors (1521789).

20121201211 is a wasteful number, since it uses less digits than its factorization.

20121201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521788.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121201211 its reverse (11210212102), we get a palindrome (31331413313).

The spelling of 20121201211 in words is "twenty billion, one hundred twenty-one million, two hundred one thousand, two hundred eleven".