121391101 has 8 divisors (see below), whose sum is σ = 138419064. Its totient is φ = 105461760.

The previous prime is 121391099. The next prime is 121391111. The reversal of 121391101 is 101193121.

It can be written as a sum of positive squares in 4 ways, for example, as 48288601 + 73102500 = 6949^2 + 8550^2 .

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 121391101 - 2¹ = 121391099 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 (121391111) 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, 274420 + ... + 274861.

It is an arithmetic number, because the mean of its divisors is an integer number (17302383).

Almost surely, 2^121391101 is an apocalyptic number.

It is an amenable number.

121391101 is a deficient number, since it is larger than the sum of its proper divisors (17027963).

121391101 is a wasteful number, since it uses less digits than its factorization.

121391101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549311.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 121391101 is about 11017.7629762125. The cubic root of 121391101 is about 495.1410692037.

The spelling of 121391101 in words is "one hundred twenty-one million, three hundred ninety-one thousand, one hundred one".