121565121 has 16 divisors (see below), whose sum is σ = 164597760. Its totient is φ = 79794000.

The previous prime is 121565111. The next prime is 121565137.

121565121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 121565121 - 2⁶ = 121565057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121565091 and 121565100.

It is not an unprimeable number, because it can be changed into a prime (121565111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161496 + ... + 162246.

It is an arithmetic number, because the mean of its divisors is an integer number (10287360).

Almost surely, 2^121565121 is an apocalyptic number.

It is an amenable number.

121565121 is a deficient number, since it is larger than the sum of its proper divisors (43032639).

121565121 is an equidigital number, since it uses as much as digits as its factorization.

121565121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516.

The product of its digits is 600, while the sum is 24.

The square root of 121565121 is about 11025.6573953665. The cubic root of 121565121 is about 495.3775591037.

The spelling of 121565121 in words is "one hundred twenty-one million, five hundred sixty-five thousand, one hundred twenty-one".