212121010102 has 4 divisors (see below), whose sum is σ = 318181515156. Its totient is φ = 106060505050.

The previous prime is 212121010043. The next prime is 212121010133. The reversal of 212121010102 is 201010121212.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×212121010102³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53030252524 + ... + 53030252527.

It is an arithmetic number, because the mean of its divisors is an integer number (79545378789).

Almost surely, 2^212121010102 is an apocalyptic number.

212121010102 is a deficient number, since it is larger than the sum of its proper divisors (106060505054).

212121010102 is a wasteful number, since it uses less digits than its factorization.

212121010102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106060505053.

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

Adding to 212121010102 its reverse (201010121212), we get a palindrome (413131131314).

It can be divided in two parts, 2121210 and 10102, that added together give a palindrome (2131312).

The spelling of 212121010102 in words is "two hundred twelve billion, one hundred twenty-one million, ten thousand, one hundred two".