20116219131521 has 2 divisors, whose sum is σ = 20116219131522. Its totient is φ = 20116219131520.

The previous prime is 20116219131457. The next prime is 20116219131527. The reversal of 20116219131521 is 12513191261102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19953293881921 + 162925249600 = 4466911^2 + 403640^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116219131521 - 2⁶ = 20116219131457 is a prime.

It is not a weakly prime, because it can be changed into another prime (20116219131527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058109565760 + 10058109565761.

It is an arithmetic number, because the mean of its divisors is an integer number (10058109565761).

Almost surely, 2^{20116219131521} is an apocalyptic number.

It is an amenable number.

20116219131521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116219131521 is an equidigital number, since it uses as much as digits as its factorization.

20116219131521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 20116219131521 in words is "twenty trillion, one hundred sixteen billion, two hundred nineteen million, one hundred thirty-one thousand, five hundred twenty-one".