16021112501 has 2 divisors, whose sum is σ = 16021112502. Its totient is φ = 16021112500.

The previous prime is 16021112489. The next prime is 16021112537. The reversal of 16021112501 is 10521112061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14984208100 + 1036904401 = 122410^2 + 32201^2 .

It is an emirp because it is prime and its reverse (10521112061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16021112501 - 2³⁰ = 14947370677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16021117501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010556250 + 8010556251.

It is an arithmetic number, because the mean of its divisors is an integer number (8010556251).

Almost surely, 2^16021112501 is an apocalyptic number.

It is an amenable number.

16021112501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16021112501 is an equidigital number, since it uses as much as digits as its factorization.

16021112501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 16021112501 its reverse (10521112061), we get a palindrome (26542224562).

The spelling of 16021112501 in words is "sixteen billion, twenty-one million, one hundred twelve thousand, five hundred one".