212200100021 has 32 divisors (see below), whose sum is σ = 267637708800. Its totient is φ = 163747894464.

The previous prime is 212200099999. The next prime is 212200100029. The reversal of 212200100021 is 120001002212.

It is a happy number.

It is not a de Polignac number, because 212200100021 - 2¹⁸ = 212199837877 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212200099975 and 212200100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212200100029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2632880 + ... + 2712278.

It is an arithmetic number, because the mean of its divisors is an integer number (8363678400).

Almost surely, 2^212200100021 is an apocalyptic number.

It is an amenable number.

212200100021 is a deficient number, since it is larger than the sum of its proper divisors (55437608779).

212200100021 is a wasteful number, since it uses less digits than its factorization.

212200100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80145.

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

Adding to 212200100021 its reverse (120001002212), we get a palindrome (332201102233).

The spelling of 212200100021 in words is "two hundred twelve billion, two hundred million, one hundred thousand, twenty-one".