212111000021 has 8 divisors (see below), whose sum is σ = 212627821824. Its totient is φ = 211594293360.

The previous prime is 212110999949. The next prime is 212111000041. The reversal of 212111000021 is 120000111212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212111000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212110999966 and 212111000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111000041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4531091 + ... + 4577663.

It is an arithmetic number, because the mean of its divisors is an integer number (26578477728).

Almost surely, 2^212111000021 is an apocalyptic number.

It is an amenable number.

212111000021 is a deficient number, since it is larger than the sum of its proper divisors (516821803).

212111000021 is a wasteful number, since it uses less digits than its factorization.

212111000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57571.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 212111000021 its reverse (120000111212), we get a palindrome (332111111233).

The spelling of 212111000021 in words is "two hundred twelve billion, one hundred eleven million, twenty-one", and thus it is an aban number.