21010021011012 has 48 divisors (see below), whose sum is σ = 53522872200000. Its totient is φ = 6361575567360.

The previous prime is 21010021010987. The next prime is 21010021011019. The reversal of 21010021011012 is 21011012001012.

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

It is not an unprimeable number, because it can be changed into a prime (21010021011019) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 63552837 + ... + 63882572.

It is an arithmetic number, because the mean of its divisors is an integer number (1115059837500).

Almost surely, 2^{21010021011012} is an apocalyptic number.

21010021011012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21010021011012 is an abundant number, since it is smaller than the sum of its proper divisors (32512851188988).

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

21010021011012 is a wasteful number, since it uses less digits than its factorization.

21010021011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127436676 (or 127436674 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21010021011012 its reverse (21011012001012), we get a palindrome (42021033012024).

It can be divided in two parts, 2101002101 and 1012, that multiplied together give a palindrome (2126214126212).

The spelling of 21010021011012 in words is "twenty-one trillion, ten billion, twenty-one million, eleven thousand, twelve".