212202010421 has 4 divisors (see below), whose sum is σ = 212204209644. Its totient is φ = 212199811200.

The previous prime is 212202010343. The next prime is 212202010477. The reversal of 212202010421 is 124010202212.

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 174143463025 + 38058547396 = 417305^2 + 195086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212202010421 is a prime.

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 212202010421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202010121) 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, 947900 + ... + 1150181.

It is an arithmetic number, because the mean of its divisors is an integer number (53051052411).

Almost surely, 2^212202010421 is an apocalyptic number.

It is an amenable number.

212202010421 is a deficient number, since it is larger than the sum of its proper divisors (2199223).

212202010421 is a wasteful number, since it uses less digits than its factorization.

212202010421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199222.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212202010421 its reverse (124010202212), we get a palindrome (336212212633).

The spelling of 212202010421 in words is "two hundred twelve billion, two hundred two million, ten thousand, four hundred twenty-one".