109699208640121 has 27 divisors (see below), whose sum is σ = 112367944191621. Its totient is φ = 107093310955704.

The previous prime is 109699208640067. The next prime is 109699208640139. The reversal of 109699208640121 is 121046802996901.

The square root of 109699208640121 is 10473739.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 109699208640121 - 2²³ = 109699200251513 is a prime.

It is a super-3 number, since 3×109699208640121³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109699208643121) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 103197749836 + ... + 103197750898.

Almost surely, 2^{109699208640121} is an apocalyptic number.

109699208640121 is the 10473739-th square number.

109699208640121 is the 5236870-th centered octagonal number.

It is an amenable number.

109699208640121 is a deficient number, since it is larger than the sum of its proper divisors (2668735551500).

109699208640121 is an frugal number, since it uses more digits than its factorization.

109699208640121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 58.

The spelling of 109699208640121 in words is "one hundred nine trillion, six hundred ninety-nine billion, two hundred eight million, six hundred forty thousand, one hundred twenty-one".