121212221101 has 8 divisors (see below), whose sum is σ = 129613069944. Its totient is φ = 112952563200.

The previous prime is 121212221063. The next prime is 121212221113. The reversal of 121212221101 is 101122212121.

It can be written as a sum of positive squares in 4 ways, for example, as 71516665476 + 49695555625 = 267426^2 + 222925^2 .

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 121212221101 - 2⁷ = 121212220973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212221401) 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, 35295960 + ... + 35299393.

It is an arithmetic number, because the mean of its divisors is an integer number (16201633743).

Almost surely, 2^121212221101 is an apocalyptic number.

It is an amenable number.

121212221101 is a deficient number, since it is larger than the sum of its proper divisors (8400848843).

121212221101 is a wasteful number, since it uses less digits than its factorization.

121212221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70595471.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121212221101 its reverse (101122212121), we get a palindrome (222334433222).

The spelling of 121212221101 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred one".