1000212212221 has 4 divisors (see below), whose sum is σ = 1003094668512. Its totient is φ = 997329755932.

The previous prime is 1000212212183. The next prime is 1000212212257. The reversal of 1000212212221 is 1222122120001.

It is a happy number.

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 1000212212221 - 2¹⁷ = 1000212081149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000212212195 and 1000212212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000212212261) 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, 1441227625 + ... + 1441228318.

It is an arithmetic number, because the mean of its divisors is an integer number (250773667128).

Almost surely, 2^{1000212212221} is an apocalyptic number.

It is an amenable number.

1000212212221 is a deficient number, since it is larger than the sum of its proper divisors (2882456291).

1000212212221 is an equidigital number, since it uses as much as digits as its factorization.

1000212212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882456290.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1000212212221 its reverse (1222122120001), we get a palindrome (2222334332222).

The spelling of 1000212212221 in words is "one trillion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".