211211212011 has 4 divisors (see below), whose sum is σ = 281614949352. Its totient is φ = 140807474672.

The previous prime is 211211211977. The next prime is 211211212021. The reversal of 211211212011 is 110212112112.

It is a happy number.

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 211211212011 - 2⁹ = 211211211499 is a prime.

It is a super-2 number, since 2×211211212011² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211211212021) 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, 35201868666 + ... + 35201868671.

It is an arithmetic number, because the mean of its divisors is an integer number (70403737338).

Almost surely, 2^211211212011 is an apocalyptic number.

211211212011 is a deficient number, since it is larger than the sum of its proper divisors (70403737341).

211211212011 is an equidigital number, since it uses as much as digits as its factorization.

211211212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70403737340.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211211212011 its reverse (110212112112), we get a palindrome (321423324123).

The spelling of 211211212011 in words is "two hundred eleven billion, two hundred eleven million, two hundred twelve thousand, eleven".