212121021011 has 16 divisors (see below), whose sum is σ = 223679397888. Its totient is φ = 200859607200.

The previous prime is 212121020987. The next prime is 212121021019. The reversal of 212121021011 is 110120121212.

It is a cyclic number.

It is not a de Polignac number, because 212121021011 - 2¹⁰ = 212121019987 is a prime.

It is a super-3 number, since 3×212121021011³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (212121021019) 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, 6486281 + ... + 6518901.

It is an arithmetic number, because the mean of its divisors is an integer number (13979962368).

Almost surely, 2^212121021011 is an apocalyptic number.

212121021011 is a deficient number, since it is larger than the sum of its proper divisors (11558376877).

212121021011 is a wasteful number, since it uses less digits than its factorization.

212121021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37162.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212121021011 its reverse (110120121212), we get a palindrome (322241142223).

The spelling of 212121021011 in words is "two hundred twelve billion, one hundred twenty-one million, twenty-one thousand, eleven".