212121102111 has 8 divisors (see below), whose sum is σ = 283394928000. Its totient is φ = 141130672152.

The previous prime is 212121102101. The next prime is 212121102121. The reversal of 212121102111 is 111201121212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212121102101) and next prime (212121102121).

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

It is not a de Polignac number, because 212121102111 - 2⁶ = 212121102047 is a prime.

It is a super-3 number, since 3×212121102111³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121102101) 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, 70847235 + ... + 70850228.

It is an arithmetic number, because the mean of its divisors is an integer number (35424366000).

Almost surely, 2^212121102111 is an apocalyptic number.

212121102111 is a deficient number, since it is larger than the sum of its proper divisors (71273825889).

212121102111 is a wasteful number, since it uses less digits than its factorization.

212121102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141697965.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212121102111 its reverse (111201121212), we get a palindrome (323322223323).

The spelling of 212121102111 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred two thousand, one hundred eleven".