121505421 has 8 divisors (see below), whose sum is σ = 162071424. Its totient is φ = 80971520.

The previous prime is 121505411. The next prime is 121505431. The reversal of 121505421 is 124505121.

It is an interprime number because it is at equal distance from previous prime (121505411) and next prime (121505431).

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 121505421 - 2⁶ = 121505357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121505411) 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, 2956 + ... + 15866.

It is an arithmetic number, because the mean of its divisors is an integer number (20258928).

Almost surely, 2^121505421 is an apocalyptic number.

It is an amenable number.

121505421 is a deficient number, since it is larger than the sum of its proper divisors (40566003).

121505421 is a wasteful number, since it uses less digits than its factorization.

121505421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16051.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 121505421 is about 11022.9497413351. The cubic root of 121505421 is about 495.2964533759.

It can be divided in two parts, 12150 and 5421, that added together give a palindrome (17571).

The spelling of 121505421 in words is "one hundred twenty-one million, five hundred five thousand, four hundred twenty-one".