20002122121 has 16 divisors (see below), whose sum is σ = 21160440000. Its totient is φ = 18878714176.

The previous prime is 20002122103. The next prime is 20002122139. The reversal of 20002122121 is 12122120002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20002122103) and next prime (20002122139).

It is a de Polignac number, because none of the positive numbers 2^k-20002122121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20002122181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273615 + ... + 338923.

It is an arithmetic number, because the mean of its divisors is an integer number (1322527500).

Almost surely, 2^20002122121 is an apocalyptic number.

It is an amenable number.

20002122121 is a deficient number, since it is larger than the sum of its proper divisors (1158317879).

20002122121 is a wasteful number, since it uses less digits than its factorization.

20002122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65576.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20002122121 its reverse (12122120002), we get a palindrome (32124242123).

The spelling of 20002122121 in words is "twenty billion, two million, one hundred twenty-two thousand, one hundred twenty-one".