212121011011 has 16 divisors (see below), whose sum is σ = 262222136064. Its totient is φ = 167092644384.

The previous prime is 212121010979. The next prime is 212121011017. The reversal of 212121011011 is 110110121212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212121011011 - 2⁵ = 212121010979 is a prime.

It is a super-3 number, since 3×212121011011³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 212121010982 and 212121011000.

It is not an unprimeable number, because it can be changed into a prime (212121011017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5113705 + ... + 5155018.

It is an arithmetic number, because the mean of its divisors is an integer number (16388883504).

Almost surely, 2^212121011011 is an apocalyptic number.

212121011011 is a deficient number, since it is larger than the sum of its proper divisors (50101125053).

212121011011 is a wasteful number, since it uses less digits than its factorization.

212121011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10268970.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 212121011011 its reverse (110110121212), we get a palindrome (322231132223).

The spelling of 212121011011 in words is "two hundred twelve billion, one hundred twenty-one million, eleven thousand, eleven".