20202121121 has 16 divisors (see below), whose sum is σ = 24952040064. Its totient is φ = 15927594624.

The previous prime is 20202121117. The next prime is 20202121123. The reversal of 20202121121 is 12112120202.

It is a cyclic number.

It is not a de Polignac number, because 20202121121 - 2² = 20202121117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20202121096 and 20202121105.

It is not an unprimeable number, because it can be changed into a prime (20202121123) by changing a digit.

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, 366476 + ... + 417981.

It is an arithmetic number, because the mean of its divisors is an integer number (1559502504).

Almost surely, 2^20202121121 is an apocalyptic number.

It is an amenable number.

20202121121 is a deficient number, since it is larger than the sum of its proper divisors (4749918943).

20202121121 is a wasteful number, since it uses less digits than its factorization.

20202121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784760.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20202121121 its reverse (12112120202), we get a palindrome (32314241323).

It can be divided in two parts, 20202 and 121121, that multiplied together give a palindrome (2446886442).

The spelling of 20202121121 in words is "twenty billion, two hundred two million, one hundred twenty-one thousand, one hundred twenty-one".