1221131101 has 8 divisors (see below), whose sum is σ = 1263818880. Its totient is φ = 1178482032.

The previous prime is 1221131047. The next prime is 1221131113. The reversal of 1221131101 is 1011311221.

It is a happy number.

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 1221131101 - 2¹³ = 1221122909 is a prime.

It is a super-2 number, since 2×1221131101² = 2982322331658944402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221131141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64176 + ... + 80998.

It is an arithmetic number, because the mean of its divisors is an integer number (157977360).

Almost surely, 2^1221131101 is an apocalyptic number.

It is an amenable number.

1221131101 is a deficient number, since it is larger than the sum of its proper divisors (42687779).

1221131101 is a wasteful number, since it uses less digits than its factorization.

1221131101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19355.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1221131101 is about 34944.6863056460. The cubic root of 1221131101 is about 1068.8598508383.

Adding to 1221131101 its reverse (1011311221), we get a palindrome (2232442322).

The spelling of 1221131101 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, one hundred one".