20012121021000 has 128 divisors (see below), whose sum is σ = 64451941032960. Its totient is φ = 5164418304000.

The previous prime is 20012121020921. The next prime is 20012121021023. The reversal of 20012121021000 is 12012121002.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 31 ways as a sum of consecutive naturals, for example, 107499049 + ... + 107685048.

It is an arithmetic number, because the mean of its divisors is an integer number (503530789320).

Almost surely, 2^{20012121021000} is an apocalyptic number.

20012121021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012121021000 is an abundant number, since it is smaller than the sum of its proper divisors (44439820011960).

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

20012121021000 is a wasteful number, since it uses less digits than its factorization.

20012121021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215184152 (or 215184138 counting only the distinct ones).

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

Adding to 20012121021000 its reverse (12012121002), we get a palindrome (20024133142002).

The spelling of 20012121021000 in words is "twenty trillion, twelve billion, one hundred twenty-one million, twenty-one thousand".