212210000021 has 4 divisors (see below), whose sum is σ = 213480718752. Its totient is φ = 210939281292.

The previous prime is 212209999993. The next prime is 212210000029. The reversal of 212210000021 is 120000012212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212210000021 - 2⁶ = 212209999957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212209999957 and 212210000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210000029) 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 3 ways as a sum of consecutive naturals, for example, 635359115 + ... + 635359448.

It is an arithmetic number, because the mean of its divisors is an integer number (53370179688).

Almost surely, 2^212210000021 is an apocalyptic number.

It is an amenable number.

212210000021 is a deficient number, since it is larger than the sum of its proper divisors (1270718731).

212210000021 is a wasteful number, since it uses less digits than its factorization.

212210000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270718730.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 212210000021 its reverse (120000012212), we get a palindrome (332210012233).

The spelling of 212210000021 in words is "two hundred twelve billion, two hundred ten million, twenty-one", and thus it is an aban number.