212121020011 has 8 divisors (see below), whose sum is σ = 217078678080. Its totient is φ = 207164480712.

The previous prime is 212121019987. The next prime is 212121020021. The reversal of 212121020011 is 110020121212.

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

It is a cyclic number.

It is not a de Polignac number, because 212121020011 - 2³¹ = 209973536363 is a prime.

It is a super-3 number, since 3×212121020011³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212121019973 and 212121020000.

It is not an unprimeable number, because it can be changed into a prime (212121020021) 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, 110220 + ... + 660598.

It is an arithmetic number, because the mean of its divisors is an integer number (27134834760).

Almost surely, 2^212121020011 is an apocalyptic number.

212121020011 is a deficient number, since it is larger than the sum of its proper divisors (4957658069).

212121020011 is an equidigital number, since it uses as much as digits as its factorization.

212121020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559385.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212121020011 its reverse (110020121212), we get a palindrome (322141141223).

The spelling of 212121020011 in words is "two hundred twelve billion, one hundred twenty-one million, twenty thousand, eleven".