121707620 has 24 divisors (see below), whose sum is σ = 255980088. Its totient is φ = 48608000.

The previous prime is 121707617. The next prime is 121707623. The reversal of 121707620 is 26707121.

It is an interprime number because it is at equal distance from previous prime (121707617) and next prime (121707623).

It can be written as a sum of positive squares in 4 ways, for example, as 50608996 + 71098624 = 7114^2 + 8432^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121707620.

It is not an unprimeable number, because it can be changed into a prime (121707623) 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 7 ways as a sum of consecutive naturals, for example, 9680 + ... + 18360.

It is an arithmetic number, because the mean of its divisors is an integer number (10665837).

Almost surely, 2^121707620 is an apocalyptic number.

121707620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121707620 is an abundant number, since it is smaller than the sum of its proper divisors (134272468).

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

121707620 is a wasteful number, since it uses less digits than its factorization.

121707620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9391 (or 9389 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 121707620 is about 11032.1176570956. The cubic root of 121707620 is about 495.5710445429.

The spelling of 121707620 in words is "one hundred twenty-one million, seven hundred seven thousand, six hundred twenty".