20520100212011 has 4 divisors (see below), whose sum is σ = 20520111128352. Its totient is φ = 20520089295672.

The previous prime is 20520100211987. The next prime is 20520100212113. The reversal of 20520100212011 is 11021200102502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20520100212011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520100212611) 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, 1838291 + ... + 6664796.

It is an arithmetic number, because the mean of its divisors is an integer number (5130027782088).

Almost surely, 2^{20520100212011} is an apocalyptic number.

20520100212011 is a deficient number, since it is larger than the sum of its proper divisors (10916341).

20520100212011 is an equidigital number, since it uses as much as digits as its factorization.

20520100212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10916340.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 20520100212011 its reverse (11021200102502), we get a palindrome (31541300314513).

The spelling of 20520100212011 in words is "twenty trillion, five hundred twenty billion, one hundred million, two hundred twelve thousand, eleven".