16126140515021 has 2 divisors, whose sum is σ = 16126140515022. Its totient is φ = 16126140515020.

The previous prime is 16126140514927. The next prime is 16126140515029. The reversal of 16126140515021 is 12051504162161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12615816015625 + 3510324499396 = 3551875^2 + 1873586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16126140515021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16126140515029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8063070257510 + 8063070257511.

It is an arithmetic number, because the mean of its divisors is an integer number (8063070257511).

Almost surely, 2^{16126140515021} is an apocalyptic number.

It is an amenable number.

16126140515021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16126140515021 is an equidigital number, since it uses as much as digits as its factorization.

16126140515021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 35.

Adding to 16126140515021 its reverse (12051504162161), we get a palindrome (28177644677182).

The spelling of 16126140515021 in words is "sixteen trillion, one hundred twenty-six billion, one hundred forty million, five hundred fifteen thousand, twenty-one".