212121102202111 has 4 divisors (see below), whose sum is σ = 212180503242424. Its totient is φ = 212061701161800.

The previous prime is 212121102202091. The next prime is 212121102202127. The reversal of 212121102202111 is 111202201121212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 212121102202111 - 2¹⁵ = 212121102169343 is a prime.

It is a super-3 number, since 3×212121102202111³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121102202171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29700514800 + ... + 29700521941.

It is an arithmetic number, because the mean of its divisors is an integer number (53045125810606).

Almost surely, 2^{212121102202111} is an apocalyptic number.

212121102202111 is a deficient number, since it is larger than the sum of its proper divisors (59401040313).

212121102202111 is an equidigital number, since it uses as much as digits as its factorization.

212121102202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59401040312.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212121102202111 its reverse (111202201121212), we get a palindrome (323323303323323).

The spelling of 212121102202111 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred two million, two hundred two thousand, one hundred eleven".