16021117501 has 2 divisors, whose sum is σ = 16021117502. Its totient is φ = 16021117500.

The previous prime is 16021117487. The next prime is 16021117507. The reversal of 16021117501 is 10571112061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15917607225 + 103510276 = 126165^2 + 10174^2 .

It is a cyclic number.

It is not a de Polignac number, because 16021117501 - 2²¹ = 16019020349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16021117507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010558750 + 8010558751.

It is an arithmetic number, because the mean of its divisors is an integer number (8010558751).

Almost surely, 2^16021117501 is an apocalyptic number.

It is an amenable number.

16021117501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16021117501 is an equidigital number, since it uses as much as digits as its factorization.

16021117501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 25.

Adding to 16021117501 its reverse (10571112061), we get a palindrome (26592229562).

The spelling of 16021117501 in words is "sixteen billion, twenty-one million, one hundred seventeen thousand, five hundred one".