1221101101 has 8 divisors (see below), whose sum is σ = 1402221600. Its totient is φ = 1051665840.

The previous prime is 1221101083. The next prime is 1221101107. The reversal of 1221101101 is 1011011221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221101101 - 2¹⁹ = 1220576813 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 (1221101107) 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, 2921086 + ... + 2921503.

It is an arithmetic number, because the mean of its divisors is an integer number (175277700).

Almost surely, 2^1221101101 is an apocalyptic number.

1221101101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221101101 is a deficient number, since it is larger than the sum of its proper divisors (181120499).

1221101101 is a wasteful number, since it uses less digits than its factorization.

1221101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5842619.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1221101101 is about 34944.2570531983. The cubic root of 1221101101 is about 1068.8510977355.

Adding to 1221101101 its reverse (1011011221), we get a palindrome (2232112322).

It can be divided in two parts, 1221 and 101101, that multiplied together give a palindrome (123444321).

The spelling of 1221101101 in words is "one billion, two hundred twenty-one million, one hundred one thousand, one hundred one".