21116204444501 has 2 divisors, whose sum is σ = 21116204444502. Its totient is φ = 21116204444500.

The previous prime is 21116204444471. The next prime is 21116204444513. The reversal of 21116204444501 is 10544440261112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15559482591601 + 5556721852900 = 3944551^2 + 2357270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21116204444501 - 2¹⁴ = 21116204428117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116201444501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558102222250 + 10558102222251.

It is an arithmetic number, because the mean of its divisors is an integer number (10558102222251).

Almost surely, 2^{21116204444501} is an apocalyptic number.

It is an amenable number.

21116204444501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116204444501 is an equidigital number, since it uses as much as digits as its factorization.

21116204444501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 35.

The spelling of 21116204444501 in words is "twenty-one trillion, one hundred sixteen billion, two hundred four million, four hundred forty-four thousand, five hundred one".