20002122222121 has 8 divisors (see below), whose sum is σ = 21541429098504. Its totient is φ = 18462912787200.

The previous prime is 20002122222101. The next prime is 20002122222143. The reversal of 20002122222121 is 12122222120002.

It can be written as a sum of positive squares in 4 ways, for example, as 10470330452521 + 9531791769600 = 3235789^2 + 3087360^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20002122222121 - 2¹³ = 20002122213929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20002122222101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23933746 + ... + 24755371.

It is an arithmetic number, because the mean of its divisors is an integer number (2692678637313).

Almost surely, 2^{20002122222121} is an apocalyptic number.

It is an amenable number.

20002122222121 is a deficient number, since it is larger than the sum of its proper divisors (1539306876383).

20002122222121 is a wasteful number, since it uses less digits than its factorization.

20002122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48720731.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20002122222121 its reverse (12122222120002), we get a palindrome (32124344342123).

The spelling of 20002122222121 in words is "twenty trillion, two billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".