212400100221 has 4 divisors (see below), whose sum is σ = 283200133632. Its totient is φ = 141600066812.

The previous prime is 212400100219. The next prime is 212400100271. The reversal of 212400100221 is 122001004212.

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 212400100221 - 2¹ = 212400100219 is a prime.

It is a super-2 number, since 2×212400100221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212400100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212400100271) 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, 35400016701 + ... + 35400016706.

It is an arithmetic number, because the mean of its divisors is an integer number (70800033408).

Almost surely, 2^212400100221 is an apocalyptic number.

It is an amenable number.

212400100221 is a deficient number, since it is larger than the sum of its proper divisors (70800033411).

212400100221 is an equidigital number, since it uses as much as digits as its factorization.

212400100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70800033410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212400100221 its reverse (122001004212), we get a palindrome (334401104433).

The spelling of 212400100221 in words is "two hundred twelve billion, four hundred million, one hundred thousand, two hundred twenty-one".