2011212121211 has 4 divisors (see below), whose sum is σ = 2020743932424. Its totient is φ = 2001680310000.

The previous prime is 2011212121147. The next prime is 2011212121213. The reversal of 2011212121211 is 1121212121102.

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 2011212121211 - 2⁶ = 2011212121147 is a prime.

It is a super-2 number, since 2×2011212121211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011212121211.

It is not an unprimeable number, because it can be changed into a prime (2011212121213) 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, 4765905290 + ... + 4765905711.

It is an arithmetic number, because the mean of its divisors is an integer number (505185983106).

Almost surely, 2^{2011212121211} is an apocalyptic number.

2011212121211 is a deficient number, since it is larger than the sum of its proper divisors (9531811213).

2011212121211 is an equidigital number, since it uses as much as digits as its factorization.

2011212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9531811212.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2011212121211 its reverse (1121212121102), we get a palindrome (3132424242313).

The spelling of 2011212121211 in words is "two trillion, eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".