20861041916273 has 8 divisors (see below), whose sum is σ = 22465894228008. Its totient is φ = 19256212001664.

The previous prime is 20861041916269. The next prime is 20861041916321. The reversal of 20861041916273 is 37261914016802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13450761630784 + 7410280285489 = 3667528^2 + 2722183^2 .

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 20861041916273 - 2² = 20861041916269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20861041919273) 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, 3639386 + ... + 7413987.

It is an arithmetic number, because the mean of its divisors is an integer number (2808236778501).

Almost surely, 2^{20861041916273} is an apocalyptic number.

It is an amenable number.

20861041916273 is a deficient number, since it is larger than the sum of its proper divisors (1604852311735).

20861041916273 is a wasteful number, since it uses less digits than its factorization.

20861041916273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11198563.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 20861041916273 in words is "twenty trillion, eight hundred sixty-one billion, forty-one million, nine hundred sixteen thousand, two hundred seventy-three".