121207640 has 16 divisors (see below), whose sum is σ = 272717280. Its totient is φ = 48483040.

The previous prime is 121207633. The next prime is 121207643. The reversal of 121207640 is 46702121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121207643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515056 + ... + 1515135.

It is an arithmetic number, because the mean of its divisors is an integer number (17044830).

Almost surely, 2^121207640 is an apocalyptic number.

121207640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121207640 is an abundant number, since it is smaller than the sum of its proper divisors (151509640).

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

121207640 is a wasteful number, since it uses less digits than its factorization.

121207640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030202 (or 3030198 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 121207640 is about 11009.4341362306. The cubic root of 121207640 is about 494.8915042967.

Adding to 121207640 its reverse (46702121), we get a palindrome (167909761).

The spelling of 121207640 in words is "one hundred twenty-one million, two hundred seven thousand, six hundred forty".