121707621 has 18 divisors (see below), whose sum is σ = 204502662. Its totient is φ = 69546960.

The previous prime is 121707617. The next prime is 121707623. The reversal of 121707621 is 126707121.

It can be written as a sum of positive squares in only one way, i.e., 114254721 + 7452900 = 10689^2 + 2730^2 .

It is not a de Polignac number, because 121707621 - 2² = 121707617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121707623) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 137550 + ... + 138431.

It is an arithmetic number, because the mean of its divisors is an integer number (11361259).

Almost surely, 2^121707621 is an apocalyptic number.

It is an amenable number.

121707621 is a deficient number, since it is larger than the sum of its proper divisors (82795041).

121707621 is a wasteful number, since it uses less digits than its factorization.

121707621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276001 (or 275991 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 121707621 is about 11032.1177024178. The cubic root of 121707621 is about 495.5710459002.

It can be divided in two parts, 12170 and 7621, that added together give a palindrome (19791).

The spelling of 121707621 in words is "one hundred twenty-one million, seven hundred seven thousand, six hundred twenty-one".