121995404793409 has 9 divisors (see below), whose sum is σ = 141913111841697. Its totient is φ = 104567423552004.

The previous prime is 121995404793397. The next prime is 121995404793487. The reversal of 121995404793409 is 904397404599121.

The square root of 121995404793409 is 11045153.

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

It is not a de Polignac number, because 121995404793409 - 2⁵ = 121995404793377 is a prime.

It is a super-2 number, since 2×121995404793409² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121995404799409) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 76527132 + ... + 78105010.

Almost surely, 2^{121995404793409} is an apocalyptic number.

121995404793409 is the 11045153-rd square number.

121995404793409 is the 5522577-th centered octagonal number.

It is an amenable number.

121995404793409 is a deficient number, since it is larger than the sum of its proper divisors (19917707048288).

121995404793409 is an frugal number, since it uses more digits than its factorization.

121995404793409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155772 (or 1577886 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 67.

The spelling of 121995404793409 in words is "one hundred twenty-one trillion, nine hundred ninety-five billion, four hundred four million, seven hundred ninety-three thousand, four hundred nine".