21001002210012 has 24 divisors (see below), whose sum is σ = 53457096534912. Its totient is φ = 6363940063600.

The previous prime is 21001002210011. The next prime is 21001002210091. The reversal of 21001002210012 is 21001220010012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21001002210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001002210011) 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 7 ways as a sum of consecutive naturals, for example, 79549250664 + ... + 79549250927.

It is an arithmetic number, because the mean of its divisors is an integer number (2227379022288).

Almost surely, 2^{21001002210012} is an apocalyptic number.

21001002210012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001002210012 is an abundant number, since it is smaller than the sum of its proper divisors (32456094324900).

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

21001002210012 is a wasteful number, since it uses less digits than its factorization.

21001002210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159098501609 (or 159098501607 counting only the distinct ones).

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

Adding to 21001002210012 its reverse (21001220010012), we get a palindrome (42002222220024).

The spelling of 21001002210012 in words is "twenty-one trillion, one billion, two million, two hundred ten thousand, twelve".