21152516300261 has 8 divisors (see below), whose sum is σ = 22052820857760. Its totient is φ = 20270774723472.

The previous prime is 21152516300243. The next prime is 21152516300327. The reversal of 21152516300261 is 16200361525112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21152516300261 - 2⁶ = 21152516300197 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 (21152516309261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4640742851 + ... + 4640747408.

It is an arithmetic number, because the mean of its divisors is an integer number (2756602607220).

Almost surely, 2^{21152516300261} is an apocalyptic number.

It is an amenable number.

21152516300261 is a deficient number, since it is larger than the sum of its proper divisors (900304557499).

21152516300261 is an equidigital number, since it uses as much as digits as its factorization.

21152516300261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9281490355.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 21152516300261 its reverse (16200361525112), we get a palindrome (37352877825373).

The spelling of 21152516300261 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred sixteen million, three hundred thousand, two hundred sixty-one".