121438564 has 24 divisors (see below), whose sum is σ = 230082048. Its totient is φ = 55750560.

The previous prime is 121438547. The next prime is 121438589. The reversal of 121438564 is 465834121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3819 + ... + 16045.

It is an arithmetic number, because the mean of its divisors is an integer number (9586752).

Almost surely, 2^121438564 is an apocalyptic number.

It is an amenable number.

121438564 is a deficient number, since it is larger than the sum of its proper divisors (108643484).

121438564 is a wasteful number, since it uses less digits than its factorization.

121438564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12435 (or 12433 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 121438564 is about 11019.9166965998. The cubic root of 121438564 is about 495.2055929295.

The spelling of 121438564 in words is "one hundred twenty-one million, four hundred thirty-eight thousand, five hundred sixty-four".