121215303405221 has 12 divisors (see below), whose sum is σ = 128766048567492. Its totient is φ = 114084102716928.

The previous prime is 121215303405193. The next prime is 121215303405241. The reversal of 121215303405221 is 122504303512121.

It can be written as a sum of positive squares in 6 ways, for example, as 61413694482721 + 59801608922500 = 7836689^2 + 7733150^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121215303405221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121215303405241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37116761 + ... + 40250273.

It is an arithmetic number, because the mean of its divisors is an integer number (10730504047291).

Almost surely, 2^{121215303405221} is an apocalyptic number.

It is an amenable number.

121215303405221 is a deficient number, since it is larger than the sum of its proper divisors (7550745162271).

121215303405221 is a wasteful number, since it uses less digits than its factorization.

121215303405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267400 (or 3267383 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 121215303405221 its reverse (122504303512121), we get a palindrome (243719606917342).

The spelling of 121215303405221 in words is "one hundred twenty-one trillion, two hundred fifteen billion, three hundred three million, four hundred five thousand, two hundred twenty-one".