1000000122221 has 4 divisors (see below), whose sum is σ = 1001545718112. Its totient is φ = 998454526332.

The previous prime is 1000000122211. The next prime is 1000000122259. The reversal of 1000000122221 is 1222210000001.

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 a de Polignac number, because none of the positive numbers 2^k-1000000122221 is a prime.

It is a Duffinian number.

1000000122221 is a modest number, since divided by 122221 gives 100 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000000122211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772796975 + ... + 772798268.

It is an arithmetic number, because the mean of its divisors is an integer number (250386429528).

Almost surely, 2^{1000000122221} is an apocalyptic number.

It is an amenable number.

1000000122221 is a deficient number, since it is larger than the sum of its proper divisors (1545595891).

1000000122221 is an equidigital number, since it uses as much as digits as its factorization.

1000000122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545595890.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1000000122221 its reverse (1222210000001), we get a palindrome (2222210122222).

The spelling of 1000000122221 in words is "one trillion, one hundred twenty-two thousand, two hundred twenty-one".