20202121105 has 16 divisors (see below), whose sum is σ = 26020209744. Its totient is φ = 15002634240.

The previous prime is 20202121099. The next prime is 20202121117. The reversal of 20202121105 is 50112120202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1098458449 + 19103662656 = 33143^2 + 138216^2 .

It is not a de Polignac number, because 20202121105 - 2³ = 20202121097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621686 + ... + 1634095.

It is an arithmetic number, because the mean of its divisors is an integer number (1626263109).

Almost surely, 2^20202121105 is an apocalyptic number.

It is an amenable number.

20202121105 is a deficient number, since it is larger than the sum of its proper divisors (5818088639).

20202121105 is a wasteful number, since it uses less digits than its factorization.

20202121105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255876.

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

Adding to 20202121105 its reverse (50112120202), we get a palindrome (70314241307).

The spelling of 20202121105 in words is "twenty billion, two hundred two million, one hundred twenty-one thousand, one hundred five".