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121221101 = 1714235011
BaseRepresentation
bin1110011100110…
…10111111101101
322110002200002102
413032122333231
5222013033401
620010104445
73001235201
oct716327755
9273080072
10121221101
1162476231
123471b125
131c163981
1412156b01
15a99756b
hex739afed

121221101 has 8 divisors (see below), whose sum is σ = 128467584. Its totient is φ = 113987520.

The previous prime is 121221077. The next prime is 121221103. The reversal of 121221101 is 101122121.

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 121221101 - 222 = 117026797 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 (121221103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21686 + ... + 26696.

It is an arithmetic number, because the mean of its divisors is an integer number (16058448).

Almost surely, 2121221101 is an apocalyptic number.

It is an amenable number.

121221101 is a deficient number, since it is larger than the sum of its proper divisors (7246483).

121221101 is a wasteful number, since it uses less digits than its factorization.

121221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6451.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 121221101 is about 11010.0454585801. The cubic root of 121221101 is about 494.9098240658.

Adding to 121221101 its reverse (101122121), we get a palindrome (222343222).

The spelling of 121221101 in words is "one hundred twenty-one million, two hundred twenty-one thousand, one hundred one".

Divisors: 1 17 1423 5011 24191 85187 7130653 121221101