1000221112221 has 64 divisors (see below), whose sum is σ = 1481192697600. Its totient is φ = 597651664896.

The previous prime is 1000221112201. The next prime is 1000221112237. The reversal of 1000221112221 is 1222111220001.

It is not a de Polignac number, because 1000221112221 - 2¹¹ = 1000221110173 is a prime.

It is a super-2 number, since 2×1000221112221² (a number of 25 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 1000221112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000221112201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41892675 + ... + 41916543.

It is an arithmetic number, because the mean of its divisors is an integer number (23143635900).

Almost surely, 2^{1000221112221} is an apocalyptic number.

It is an amenable number.

1000221112221 is a deficient number, since it is larger than the sum of its proper divisors (480971585379).

1000221112221 is a wasteful number, since it uses less digits than its factorization.

1000221112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24398.

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

Adding to 1000221112221 its reverse (1222111220001), we get a palindrome (2222332332222).

The spelling of 1000221112221 in words is "one trillion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".