212121211011 has 8 divisors (see below), whose sum is σ = 290472289104. Its totient is φ = 137592136800.

The previous prime is 212121211009. The next prime is 212121211019. The reversal of 212121211011 is 110112121212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212121211011 - 2¹ = 212121211009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212121211019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955500840 + ... + 955501061.

It is an arithmetic number, because the mean of its divisors is an integer number (36309036138).

Almost surely, 2^212121211011 is an apocalyptic number.

212121211011 is a deficient number, since it is larger than the sum of its proper divisors (78351078093).

212121211011 is a wasteful number, since it uses less digits than its factorization.

212121211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911001941.

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

Adding to 212121211011 its reverse (110112121212), we get a palindrome (322233332223).

It can be divided in two parts, 2121212 and 11011, that multiplied together give a palindrome (23356665332).

The spelling of 212121211011 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, eleven".