20521682711 has 4 divisors (see below), whose sum is σ = 20575264512. Its totient is φ = 20468100912.

The previous prime is 20521682707. The next prime is 20521682717. The reversal of 20521682711 is 11728612502.

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

It is a cyclic number.

It is not a de Polignac number, because 20521682711 - 2² = 20521682707 is a prime.

It is a super-2 number, since 2×20521682711² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521682717) 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, 26790326 + ... + 26791091.

It is an arithmetic number, because the mean of its divisors is an integer number (5143816128).

Almost surely, 2^20521682711 is an apocalyptic number.

20521682711 is a deficient number, since it is larger than the sum of its proper divisors (53581801).

20521682711 is an equidigital number, since it uses as much as digits as its factorization.

20521682711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53581800.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 20521682711 in words is "twenty billion, five hundred twenty-one million, six hundred eighty-two thousand, seven hundred eleven".