21010000121000 has 64 divisors (see below), whose sum is σ = 53632800336960. Its totient is φ = 7640000040000.

The previous prime is 21010000120937. The next prime is 21010000121021. The reversal of 21010000121000 is 12100001012.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 954989006 + ... + 955011005.

It is an arithmetic number, because the mean of its divisors is an integer number (838012505265).

Almost surely, 2^{21010000121000} is an apocalyptic number.

21010000121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010000121000 is an abundant number, since it is smaller than the sum of its proper divisors (32622800215960).

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

21010000121000 is a wasteful number, since it uses less digits than its factorization.

21010000121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910000043 (or 1910000029 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21010000121000 its reverse (12100001012), we get a palindrome (21022100122012).

It can be divided in two parts, 2101000012 and 1000, that added together give a palindrome (2101001012).

The spelling of 21010000121000 in words is "twenty-one trillion, ten billion, one hundred twenty-one thousand".