1001022231221 has 2 divisors, whose sum is σ = 1001022231222. Its totient is φ = 1001022231220.

The previous prime is 1001022231197. The next prime is 1001022231233. The reversal of 1001022231221 is 1221322201001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717220978321 + 283801252900 = 846889^2 + 532730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001022231221 - 2³⁸ = 726144324277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001022231221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001022231241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500511115610 + 500511115611.

It is an arithmetic number, because the mean of its divisors is an integer number (500511115611).

Almost surely, 2^{1001022231221} is an apocalyptic number.

It is an amenable number.

1001022231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001022231221 is an equidigital number, since it uses as much as digits as its factorization.

1001022231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1001022231221 its reverse (1221322201001), we get a palindrome (2222344432222).

The spelling of 1001022231221 in words is "one trillion, one billion, twenty-two million, two hundred thirty-one thousand, two hundred twenty-one".