1212221101 has 8 divisors (see below), whose sum is σ = 1491964544. Its totient is φ = 959119920.

The previous prime is 1212221093. The next prime is 1212221119. The reversal of 1212221101 is 1011222121.

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 1212221101 - 2³ = 1212221093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6660465 + ... + 6660646.

It is an arithmetic number, because the mean of its divisors is an integer number (186495568).

Almost surely, 2^1212221101 is an apocalyptic number.

It is an amenable number.

1212221101 is a deficient number, since it is larger than the sum of its proper divisors (279743443).

1212221101 is a wasteful number, since it uses less digits than its factorization.

1212221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13321131.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1212221101 is about 34816.9657063909. The cubic root of 1212221101 is about 1066.2538520504.

Adding to 1212221101 its reverse (1011222121), we get a palindrome (2223443222).

It can be divided in two parts, 121 and 2221101, that added together give a palindrome (2221222).

The spelling of 1212221101 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred one".