212110001202221 has 4 divisors (see below), whose sum is σ = 212110202093532. Its totient is φ = 212109800310912.

The previous prime is 212110001202217. The next prime is 212110001202223. The reversal of 212110001202221 is 122202100011212.

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 144870230802025 + 67239770400196 = 12036205^2 + 8199986^2 .

It is a cyclic number.

It is not a de Polignac number, because 212110001202221 - 2² = 212110001202217 is a prime.

It is a super-2 number, since 2×212110001202221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212110001202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110001202223) 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, 98853476 + ... + 100976381.

It is an arithmetic number, because the mean of its divisors is an integer number (53027550523383).

Almost surely, 2^{212110001202221} is an apocalyptic number.

It is an amenable number.

212110001202221 is a deficient number, since it is larger than the sum of its proper divisors (200891311).

212110001202221 is a wasteful number, since it uses less digits than its factorization.

212110001202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200891310.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212110001202221 its reverse (122202100011212), we get a palindrome (334312101213433).

The spelling of 212110001202221 in words is "two hundred twelve trillion, one hundred ten billion, one million, two hundred two thousand, two hundred twenty-one".