212200010021 has 4 divisors (see below), whose sum is σ = 212249397612. Its totient is φ = 212150622432.

The previous prime is 212200010017. The next prime is 212200010023. The reversal of 212200010021 is 120010002212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104871697921 + 107328312100 = 323839^2 + 327610^2 .

It is a cyclic number.

It is not a de Polignac number, because 212200010021 - 2² = 212200010017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212200009984 and 212200010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212200010023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24687350 + ... + 24695943.

It is an arithmetic number, because the mean of its divisors is an integer number (53062349403).

Almost surely, 2^212200010021 is an apocalyptic number.

It is an amenable number.

212200010021 is a deficient number, since it is larger than the sum of its proper divisors (49387591).

212200010021 is an equidigital number, since it uses as much as digits as its factorization.

212200010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49387590.

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

Adding to 212200010021 its reverse (120010002212), we get a palindrome (332210012233).

The spelling of 212200010021 in words is "two hundred twelve billion, two hundred million, ten thousand, twenty-one".