121211101 has 4 divisors (see below), whose sum is σ = 132230304. Its totient is φ = 110191900.

The previous prime is 121211063. The next prime is 121211113. The reversal of 121211101 is 101112121.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121211101 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 (121218101) 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, 5509585 + ... + 5509606.

It is an arithmetic number, because the mean of its divisors is an integer number (33057576).

Almost surely, 2^121211101 is an apocalyptic number.

121211101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121211101 is a deficient number, since it is larger than the sum of its proper divisors (11019203).

121211101 is a wasteful number, since it uses less digits than its factorization.

121211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11019202.

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

The square root of 121211101 is about 11009.5913184823. The cubic root of 121211101 is about 494.8962146796.

Adding to 121211101 its reverse (101112121), we get a palindrome (222323222).

The spelling of 121211101 in words is "one hundred twenty-one million, two hundred eleven thousand, one hundred one".