20101311021013 has 4 divisors (see below), whose sum is σ = 20794459676940. Its totient is φ = 19408162365088.

The previous prime is 20101311020977. The next prime is 20101311021019. The reversal of 20101311021013 is 31012011310102.

It is a happy number.

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 11157724341124 + 8943586679889 = 3340318^2 + 2990583^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101311021013 - 2⁹ = 20101311020501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101311021019) 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, 346574327920 + ... + 346574327977.

It is an arithmetic number, because the mean of its divisors is an integer number (5198614919235).

Almost surely, 2^{20101311021013} is an apocalyptic number.

It is an amenable number.

20101311021013 is a deficient number, since it is larger than the sum of its proper divisors (693148655927).

20101311021013 is an equidigital number, since it uses as much as digits as its factorization.

20101311021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693148655926.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20101311021013 its reverse (31012011310102), we get a palindrome (51113322331115).

The spelling of 20101311021013 in words is "twenty trillion, one hundred one billion, three hundred eleven million, twenty-one thousand, thirteen".