1000212211221 has 32 divisors (see below), whose sum is σ = 1452698582400. Its totient is φ = 609726136320.

The previous prime is 1000212211217. The next prime is 1000212211247. The reversal of 1000212211221 is 1221122120001.

It is not a de Polignac number, because 1000212211221 - 2² = 1000212211217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000212211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000212216221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4927285 + ... + 5126261.

It is an arithmetic number, because the mean of its divisors is an integer number (45396830700).

Almost surely, 2^{1000212211221} is an apocalyptic number.

It is an amenable number.

1000212211221 is a deficient number, since it is larger than the sum of its proper divisors (452486371179).

1000212211221 is a wasteful number, since it uses less digits than its factorization.

1000212211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202069.

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

Adding to 1000212211221 its reverse (1221122120001), we get a palindrome (2221334331222).

The spelling of 1000212211221 in words is "one trillion, two hundred twelve million, two hundred eleven thousand, two hundred twenty-one".