1521132421187 has 2 divisors, whose sum is σ = 1521132421188. Its totient is φ = 1521132421186.

The previous prime is 1521132421157. The next prime is 1521132421199. The reversal of 1521132421187 is 7811242311251.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1521132421187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1521132421187.

It is not a weakly prime, because it can be changed into another prime (1521132421157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760566210593 + 760566210594.

It is an arithmetic number, because the mean of its divisors is an integer number (760566210594).

Almost surely, 2^{1521132421187} is an apocalyptic number.

1521132421187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521132421187 is an equidigital number, since it uses as much as digits as its factorization.

1521132421187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The spelling of 1521132421187 in words is "one trillion, five hundred twenty-one billion, one hundred thirty-two million, four hundred twenty-one thousand, one hundred eighty-seven".