121821103 has 8 divisors (see below), whose sum is σ = 132369920. Its totient is φ = 111686040.

The previous prime is 121821101. The next prime is 121821143. The reversal of 121821103 is 301128121.

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 121821103 - 2¹ = 121821101 is a prime.

It is a super-2 number, since 2×121821103² = 29680762272273218, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121821101) 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, 102825 + ... + 104002.

It is an arithmetic number, because the mean of its divisors is an integer number (16546240).

Almost surely, 2^121821103 is an apocalyptic number.

121821103 is a deficient number, since it is larger than the sum of its proper divisors (10548817).

121821103 is a wasteful number, since it uses less digits than its factorization.

121821103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206877.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 121821103 is about 11037.2597595599. The cubic root of 121821103 is about 495.7250239963.

Adding to 121821103 its reverse (301128121), we get a palindrome (422949224).

The spelling of 121821103 in words is "one hundred twenty-one million, eight hundred twenty-one thousand, one hundred three".