1000121212221 has 8 divisors (see below), whose sum is σ = 1369535353824. Its totient is φ = 648727272720.

The previous prime is 1000121212193. The next prime is 1000121212229. The reversal of 1000121212221 is 1222121210001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1000121212221 - 2¹⁰ = 1000121211197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000121212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000121212229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4505050395 + ... + 4505050616.

It is an arithmetic number, because the mean of its divisors is an integer number (171191919228).

Almost surely, 2^{1000121212221} is an apocalyptic number.

It is an amenable number.

1000121212221 is a deficient number, since it is larger than the sum of its proper divisors (369414141603).

1000121212221 is an equidigital number, since it uses as much as digits as its factorization.

1000121212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010101051.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1000121212221 its reverse (1222121210001), we get a palindrome (2222242422222).

The spelling of 1000121212221 in words is "one trillion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".