121438505 has 16 divisors (see below), whose sum is σ = 154341504. Its totient is φ = 91534080.

The previous prime is 121438469. The next prime is 121438517. The reversal of 121438505 is 505834121.

It is not a de Polignac number, because 121438505 - 2¹⁴ = 121422121 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176 + ... + 15585.

It is an arithmetic number, because the mean of its divisors is an integer number (9646344).

Almost surely, 2^121438505 is an apocalyptic number.

It is an amenable number.

121438505 is a deficient number, since it is larger than the sum of its proper divisors (32902999).

121438505 is a wasteful number, since it uses less digits than its factorization.

121438505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15856.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 121438505 is about 11019.9140196283. The cubic root of 121438505 is about 495.2055127322.

The spelling of 121438505 in words is "one hundred twenty-one million, four hundred thirty-eight thousand, five hundred five".