1001100221 has 8 divisors (see below), whose sum is σ = 1092338688. Its totient is φ = 909900000.

The previous prime is 1001100179. The next prime is 1001100223. The reversal of 1001100221 is 1220011001.

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-1001100221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001100199 and 1001100208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001100223) 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, 93956 + ... + 104066.

It is an arithmetic number, because the mean of its divisors is an integer number (136542336).

Almost surely, 2^1001100221 is an apocalyptic number.

1001100221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001100221 is a deficient number, since it is larger than the sum of its proper divisors (91238467).

1001100221 is a wasteful number, since it uses less digits than its factorization.

1001100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19123.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1001100221 is about 31640.1678408949. The cubic root of 1001100221 is about 1000.3666059170.

Adding to 1001100221 its reverse (1220011001), we get a palindrome (2221111222).

The spelling of 1001100221 in words is "one billion, one million, one hundred thousand, two hundred twenty-one".