1102001221 has 4 divisors (see below), whose sum is σ = 1102072972. Its totient is φ = 1101929472.

The previous prime is 1102001191. The next prime is 1102001249. The reversal of 1102001221 is 1221002011.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 78960996 + 1023040225 = 8886^2 + 31985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1102001221 - 2⁹ = 1102000709 is a prime.

It is a Duffinian number.

1102001221 is a modest number, since divided by 1221 gives 1102 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1102001198 and 1102001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102001261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2466 + ... + 47011.

It is an arithmetic number, because the mean of its divisors is an integer number (275518243).

Almost surely, 2^1102001221 is an apocalyptic number.

It is an amenable number.

1102001221 is a deficient number, since it is larger than the sum of its proper divisors (71751).

1102001221 is an equidigital number, since it uses as much as digits as its factorization.

1102001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71750.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1102001221 is about 33196.4037359471. The cubic root of 1102001221 is about 1032.9057424663.

Adding to 1102001221 its reverse (1221002011), we get a palindrome (2323003232).

The spelling of 1102001221 in words is "one billion, one hundred two million, one thousand, two hundred twenty-one".