212111120110021 has 8 divisors (see below), whose sum is σ = 232123898581344. Its totient is φ = 192219999867120.

The previous prime is 212111120110009. The next prime is 212111120110081. The reversal of 212111120110021 is 120011021111212.

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

It is a cyclic number.

It is not a de Polignac number, because 212111120110021 - 2¹⁹ = 212111119585733 is a prime.

It is a super-4 number, since 4×212111120110021⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 212111120109977 and 212111120110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111120110081) 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, 30414553455 + ... + 30414560428.

It is an arithmetic number, because the mean of its divisors is an integer number (29015487322668).

Almost surely, 2^{212111120110021} is an apocalyptic number.

It is an amenable number.

212111120110021 is a deficient number, since it is larger than the sum of its proper divisors (20012778471323).

212111120110021 is a wasteful number, since it uses less digits than its factorization.

212111120110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60829114211.

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

Adding to 212111120110021 its reverse (120011021111212), we get a palindrome (332122141221233).

The spelling of 212111120110021 in words is "two hundred twelve trillion, one hundred eleven billion, one hundred twenty million, one hundred ten thousand, twenty-one".