211212211011 has 4 divisors (see below), whose sum is σ = 281616281352. Its totient is φ = 140808140672.

The previous prime is 211212210973. The next prime is 211212211037. The reversal of 211212211011 is 110112212112.

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 211212211011 - 2⁶ = 211212210947 is a prime.

It is a super-2 number, since 2×211212211011² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211212211051) 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, 35202035166 + ... + 35202035171.

It is an arithmetic number, because the mean of its divisors is an integer number (70404070338).

Almost surely, 2^211212211011 is an apocalyptic number.

211212211011 is a deficient number, since it is larger than the sum of its proper divisors (70404070341).

211212211011 is an equidigital number, since it uses as much as digits as its factorization.

211212211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70404070340.

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

Adding to 211212211011 its reverse (110112212112), we get a palindrome (321324423123).

The spelling of 211212211011 in words is "two hundred eleven billion, two hundred twelve million, two hundred eleven thousand, eleven".