1001222012221 has 8 divisors (see below), whose sum is σ = 1001956872384. Its totient is φ = 1000487326080.

The previous prime is 1001222012137. The next prime is 1001222012237. The reversal of 1001222012221 is 1222102221001.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001222012221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001222012195 and 1001222012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222012261) 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, 12843066 + ... + 12920788.

It is an arithmetic number, because the mean of its divisors is an integer number (125244609048).

Almost surely, 2^{1001222012221} is an apocalyptic number.

It is an amenable number.

1001222012221 is a deficient number, since it is larger than the sum of its proper divisors (734860163).

1001222012221 is an equidigital number, since it uses as much as digits as its factorization.

1001222012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87011.

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

Adding to 1001222012221 its reverse (1222102221001), we get a palindrome (2223324233222).

The spelling of 1001222012221 in words is "one trillion, one billion, two hundred twenty-two million, twelve thousand, two hundred twenty-one".