121405154 has 8 divisors (see below), whose sum is σ = 196116060. Its totient is φ = 56033136.

The previous prime is 121405147. The next prime is 121405169. The reversal of 121405154 is 451504121.

It can be written as a sum of positive squares in 2 ways, for example, as 120450625 + 954529 = 10975^2 + 977^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×121405154² = 29478422835527432, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2334689 + ... + 2334740.

Almost surely, 2^121405154 is an apocalyptic number.

121405154 is a deficient number, since it is larger than the sum of its proper divisors (74710906).

121405154 is a wasteful number, since it uses less digits than its factorization.

121405154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4669444.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 121405154 is about 11018.4007006462. The cubic root of 121405154 is about 495.1601753515.

Adding to 121405154 its reverse (451504121), we get a palindrome (572909275).

The spelling of 121405154 in words is "one hundred twenty-one million, four hundred five thousand, one hundred fifty-four".