21653051446561 has 8 divisors (see below), whose sum is σ = 22065481718784. Its totient is φ = 21242474794320.

The previous prime is 21653051446547. The next prime is 21653051446577. The reversal of 21653051446561 is 16564415035612.

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 21653051446561 - 2⁵ = 21653051446529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21653051446661) 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, 463381411 + ... + 463428136.

It is an arithmetic number, because the mean of its divisors is an integer number (2758185214848).

Almost surely, 2^{21653051446561} is an apocalyptic number.

It is an amenable number.

21653051446561 is a deficient number, since it is larger than the sum of its proper divisors (412430272223).

21653051446561 is an equidigital number, since it uses as much as digits as its factorization.

21653051446561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926809991.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 21653051446561 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-one million, four hundred forty-six thousand, five hundred sixty-one".