121640502 has 8 divisors (see below), whose sum is σ = 243281016. Its totient is φ = 40546832.

The previous prime is 121640437. The next prime is 121640509. The reversal of 121640502 is 205046121.

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

121640502 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121640509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10136703 + ... + 10136714.

It is an arithmetic number, because the mean of its divisors is an integer number (30410127).

Almost surely, 2^121640502 is an apocalyptic number.

121640502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121640502 is a wasteful number, since it uses less digits than its factorization.

121640502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20273422.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 121640502 is about 11029.0753012209. The cubic root of 121640502 is about 495.4799304080.

Adding to 121640502 its reverse (205046121), we get a palindrome (326686623).

The spelling of 121640502 in words is "one hundred twenty-one million, six hundred forty thousand, five hundred two".