121540664 has 16 divisors (see below), whose sum is σ = 260444400. Its totient is φ = 52088832.

The previous prime is 121540603. The next prime is 121540669. The reversal of 121540664 is 466045121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121540669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085129 + ... + 1085240.

It is an arithmetic number, because the mean of its divisors is an integer number (16277775).

Almost surely, 2^121540664 is an apocalyptic number.

121540664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121540664 is an abundant number, since it is smaller than the sum of its proper divisors (138903736).

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

121540664 is a wasteful number, since it uses less digits than its factorization.

121540664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170382 (or 2170378 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 121540664 is about 11024.5482447128. The cubic root of 121540664 is about 495.3443361380.

Adding to 121540664 its reverse (466045121), we get a palindrome (587585785).

The spelling of 121540664 in words is "one hundred twenty-one million, five hundred forty thousand, six hundred sixty-four".