20511217210710 has 16 divisors (see below), whose sum is σ = 49226921305776. Its totient is φ = 5469657922848.

The previous prime is 20511217210691. The next prime is 20511217210751. The reversal of 20511217210710 is 1701271211502.

It is a super-2 number, since 2×20511217210710² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 683707240357 = 20511217210710 / (2 + 0 + 5 + 1 + 1 + 2 + 1 + 7 + 2 + 1 + 0 + 7 + 1 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341853620149 + ... + 341853620208.

It is an arithmetic number, because the mean of its divisors is an integer number (3076682581611).

Almost surely, 2^{20511217210710} is an apocalyptic number.

20511217210710 is an abundant number, since it is smaller than the sum of its proper divisors (28715704095066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20511217210710 is a wasteful number, since it uses less digits than its factorization.

20511217210710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683707240367.

The product of its (nonzero) digits is 1960, while the sum is 30.

The spelling of 20511217210710 in words is "twenty trillion, five hundred eleven billion, two hundred seventeen million, two hundred ten thousand, seven hundred ten".