121615845121 has 16 divisors (see below), whose sum is σ = 126067698000. Its totient is φ = 117226303488.

The previous prime is 121615845101. The next prime is 121615845133. The reversal of 121615845121 is 121548516121.

It can be written as a sum of positive squares in 8 ways, for example, as 5225699521 + 116390145600 = 72289^2 + 341160^2 .

It is a cyclic number.

It is not a de Polignac number, because 121615845121 - 2¹³ = 121615836929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121615845101) 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, 10902655 + ... + 10913803.

It is an arithmetic number, because the mean of its divisors is an integer number (7879231125).

Almost surely, 2^121615845121 is an apocalyptic number.

It is an amenable number.

121615845121 is a deficient number, since it is larger than the sum of its proper divisors (4451852879).

121615845121 is a wasteful number, since it uses less digits than its factorization.

121615845121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13908.

The product of its digits is 19200, while the sum is 37.

The spelling of 121615845121 in words is "one hundred twenty-one billion, six hundred fifteen million, eight hundred forty-five thousand, one hundred twenty-one".