212111102621 has 16 divisors (see below), whose sum is σ = 232902770688. Its totient is φ = 191572134000.

The previous prime is 212111102597. The next prime is 212111102653. The reversal of 212111102621 is 126201111212.

212111102621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212111102621 is a prime.

It is a super-2 number, since 2×212111102621² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212111102593 and 212111102602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111105621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3554396 + ... + 3613578.

It is an arithmetic number, because the mean of its divisors is an integer number (14556423168).

Almost surely, 2^212111102621 is an apocalyptic number.

It is an amenable number.

212111102621 is a deficient number, since it is larger than the sum of its proper divisors (20791668067).

212111102621 is a wasteful number, since it uses less digits than its factorization.

212111102621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61312.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 212111102621 its reverse (126201111212), we get a palindrome (338312213833).

The spelling of 212111102621 in words is "two hundred twelve billion, one hundred eleven million, one hundred two thousand, six hundred twenty-one".