212121011031 has 16 divisors (see below), whose sum is σ = 291812060160. Its totient is φ = 136989534240.

The previous prime is 212121011017. The next prime is 212121011033. The reversal of 212121011031 is 130110121212.

It is not a de Polignac number, because 212121011031 - 2¹⁵ = 212120978263 is a prime.

It is a super-3 number, since 3×212121011031³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 212121011031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121011033) 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, 8431075 + ... + 8456196.

It is an arithmetic number, because the mean of its divisors is an integer number (18238253760).

Almost surely, 2^212121011031 is an apocalyptic number.

212121011031 is a deficient number, since it is larger than the sum of its proper divisors (79691049129).

212121011031 is a wasteful number, since it uses less digits than its factorization.

212121011031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16887406.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 212121011031 its reverse (130110121212), we get a palindrome (342231132243).

The spelling of 212121011031 in words is "two hundred twelve billion, one hundred twenty-one million, eleven thousand, thirty-one".