121099506 has 64 divisors (see below), whose sum is σ = 271848960. Its totient is φ = 35653760.

The previous prime is 121099493. The next prime is 121099513. The reversal of 121099506 is 605990121.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 533365 + ... + 533591.

It is an arithmetic number, because the mean of its divisors is an integer number (4247640).

Almost surely, 2^121099506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121099506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135924480).

121099506 is an abundant number, since it is smaller than the sum of its proper divisors (150749454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121099506 is a wasteful number, since it uses less digits than its factorization.

121099506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 121099506 is about 11004.5220704945. The cubic root of 121099506 is about 494.7442899243.

The spelling of 121099506 in words is "one hundred twenty-one million, ninety-nine thousand, five hundred six".