20727252076721 has 4 divisors (see below), whose sum is σ = 20727644921700. Its totient is φ = 20726859231744.

The previous prime is 20727252076673. The next prime is 20727252076781. The reversal of 20727252076721 is 12767025272702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9358924903696 + 11368327173025 = 3059236^2 + 3371695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727252076721 - 2²² = 20727247882417 is a prime.

It is a super-3 number, since 3×20727252076721³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20727252076721.

It is not an unprimeable number, because it can be changed into a prime (20727252076781) 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, 196343336 + ... + 196448873.

It is an arithmetic number, because the mean of its divisors is an integer number (5181911230425).

Almost surely, 2^{20727252076721} is an apocalyptic number.

It is an amenable number.

20727252076721 is a deficient number, since it is larger than the sum of its proper divisors (392844979).

20727252076721 is an equidigital number, since it uses as much as digits as its factorization.

20727252076721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392844978.

The product of its (nonzero) digits is 2304960, while the sum is 50.

The spelling of 20727252076721 in words is "twenty trillion, seven hundred twenty-seven billion, two hundred fifty-two million, seventy-six thousand, seven hundred twenty-one".