21010100012 has 72 divisors (see below), whose sum is σ = 42687289008. Its totient is φ = 8971648000.

The previous prime is 21010099987. The next prime is 21010100021. The reversal of 21010100012 is 21000101012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8912738 + ... + 8915094.

It is an arithmetic number, because the mean of its divisors is an integer number (592879014).

Almost surely, 2^21010100012 is an apocalyptic number.

21010100012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21010100012 is an abundant number, since it is smaller than the sum of its proper divisors (21677188996).

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

21010100012 is a wasteful number, since it uses less digits than its factorization.

21010100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107 (or 3088 counting only the distinct ones).

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

Adding to 21010100012 its reverse (21000101012), we get a palindrome (42010201024).

It can be divided in two parts, 210101000 and 12, that added together give a palindrome (210101012).

The spelling of 21010100012 in words is "twenty-one billion, ten million, one hundred thousand, twelve".