1000221320091 has 32 divisors (see below), whose sum is σ = 1541107376640. Its totient is φ = 565217662464.

The previous prime is 1000221320053. The next prime is 1000221320099. The reversal of 1000221320091 is 1900231220001.

It is not a de Polignac number, because 1000221320091 - 2⁷ = 1000221319963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1000221320099) 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, 575505 + ... + 1526973.

It is an arithmetic number, because the mean of its divisors is an integer number (48159605520).

Almost surely, 2^{1000221320091} is an apocalyptic number.

1000221320091 is a deficient number, since it is larger than the sum of its proper divisors (540886056549).

1000221320091 is a wasteful number, since it uses less digits than its factorization.

1000221320091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952035.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1000221320091 its reverse (1900231220001), we get a palindrome (2900452540092).

The spelling of 1000221320091 in words is "one trillion, two hundred twenty-one million, three hundred twenty thousand, ninety-one".