1101012221 has 4 divisors (see below), whose sum is σ = 1101078912. Its totient is φ = 1100945532.

The previous prime is 1101012197. The next prime is 1101012257. The reversal of 1101012221 is 1222101011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1222101011 = 16661 ⋅73351.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1101012221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101012421) 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, 11726 + ... + 48368.

It is an arithmetic number, because the mean of its divisors is an integer number (275269728).

Almost surely, 2^1101012221 is an apocalyptic number.

It is an amenable number.

1101012221 is a deficient number, since it is larger than the sum of its proper divisors (66691).

1101012221 is an equidigital number, since it uses as much as digits as its factorization.

1101012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66690.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1101012221 is about 33181.5042003825. The cubic root of 1101012221 is about 1032.5966534169.

Adding to 1101012221 its reverse (1222101011), we get a palindrome (2323113232).

The spelling of 1101012221 in words is "one billion, one hundred one million, twelve thousand, two hundred twenty-one".