20000121001002 has 24 divisors (see below), whose sum is σ = 44043982316100. Its totient is φ = 6557416721280.

The previous prime is 20000121000991. The next prime is 20000121001039. The reversal of 20000121001002 is 20010012100002.

It can be written as a sum of positive squares in 2 ways, for example, as 16637514945921 + 3362606055081 = 4078911^2 + 1833741^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

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 11 ways as a sum of consecutive naturals, for example, 9107522127 + ... + 9107524322.

Almost surely, 2^{20000121001002} is an apocalyptic number.

20000121001002 is an abundant number, since it is smaller than the sum of its proper divisors (24043861315098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20000121001002 is a wasteful number, since it uses less digits than its factorization.

20000121001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18215046518 (or 18215046515 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20000121001002 its reverse (20010012100002), we get a palindrome (40010133101004).

The spelling of 20000121001002 in words is "twenty trillion, one hundred twenty-one million, one thousand, two".