20001012121002 has 128 divisors (see below), whose sum is σ = 45392016384000. Its totient is φ = 5819709772800.

The previous prime is 20001012120977. The next prime is 20001012121037. The reversal of 20001012121002 is 20012121010002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 871074802 + ... + 871097762.

It is an arithmetic number, because the mean of its divisors is an integer number (354625128000).

Almost surely, 2^{20001012121002} is an apocalyptic number.

20001012121002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001012121002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22696008192000).

20001012121002 is an abundant number, since it is smaller than the sum of its proper divisors (25391004262998).

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

20001012121002 is a wasteful number, since it uses less digits than its factorization.

20001012121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25492.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001012121002 its reverse (20012121010002), we get a palindrome (40013133131004).

The spelling of 20001012121002 in words is "twenty trillion, one billion, twelve million, one hundred twenty-one thousand, two".