21365010201061 has 4 divisors (see below), whose sum is σ = 21365020396012. Its totient is φ = 21365000006112.

The previous prime is 21365010201049. The next prime is 21365010201121. The reversal of 21365010201061 is 16010201056312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11514790289025 + 9850219912036 = 3393345^2 + 3138506^2 .

It is a cyclic number.

It is not a de Polignac number, because 21365010201061 - 2⁹ = 21365010200549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365010261061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675126 + ... + 6571591.

It is an arithmetic number, because the mean of its divisors is an integer number (5341255099003).

Almost surely, 2^{21365010201061} is an apocalyptic number.

It is an amenable number.

21365010201061 is a deficient number, since it is larger than the sum of its proper divisors (10194951).

21365010201061 is an equidigital number, since it uses as much as digits as its factorization.

21365010201061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10194950.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 21365010201061 its reverse (16010201056312), we get a palindrome (37375211257373).

The spelling of 21365010201061 in words is "twenty-one trillion, three hundred sixty-five billion, ten million, two hundred one thousand, sixty-one".