20021202010105 has 4 divisors (see below), whose sum is σ = 24025442412132. Its totient is φ = 16016961608080.

The previous prime is 20021202010099. The next prime is 20021202010193. The reversal of 20021202010105 is 50101020212002.

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 6494194753641 + 13527007256464 = 2548371^2 + 3677908^2 .

It is not a de Polignac number, because 20021202010105 - 2²⁹ = 20020665139193 is a prime.

It is a super-2 number, since 2×20021202010105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002120201006 + ... + 2002120201015.

It is an arithmetic number, because the mean of its divisors is an integer number (6006360603033).

Almost surely, 2^{20021202010105} is an apocalyptic number.

It is an amenable number.

20021202010105 is a deficient number, since it is larger than the sum of its proper divisors (4004240402027).

20021202010105 is an equidigital number, since it uses as much as digits as its factorization.

20021202010105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004240402026.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20021202010105 its reverse (50101020212002), we get a palindrome (70122222222107).

The spelling of 20021202010105 in words is "twenty trillion, twenty-one billion, two hundred two million, ten thousand, one hundred five".