20100121000 has 64 divisors (see below), whose sum is σ = 48551592960. Its totient is φ = 7780680000.

The previous prime is 20100120991. The next prime is 20100121021. The reversal of 20100121000 is 12100102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293196 + ... + 355195.

It is an arithmetic number, because the mean of its divisors is an integer number (758618640).

Almost surely, 2^20100121000 is an apocalyptic number.

20100121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100121000 is an abundant number, since it is smaller than the sum of its proper divisors (28451471960).

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

20100121000 is a wasteful number, since it uses less digits than its factorization.

20100121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648443 (or 648429 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20100121000 its reverse (12100102), we get a palindrome (20112221102).

The spelling of 20100121000 in words is "twenty billion, one hundred million, one hundred twenty-one thousand".