21021021210012 has 24 divisors (see below), whose sum is σ = 49126781757312. Its totient is φ = 6995902460400.

The previous prime is 21021021209983. The next prime is 21021021210019. The reversal of 21021021210012 is 21001212012012.

It is a junction number, because it is equal to n+sod(n) for n = 21021021209973 and 21021021210000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021021210019) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1388068314 + ... + 1388083457.

It is an arithmetic number, because the mean of its divisors is an integer number (2046949239888).

Almost surely, 2^{21021021210012} is an apocalyptic number.

It is an amenable number.

21021021210012 is an abundant number, since it is smaller than the sum of its proper divisors (28105760547300).

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

21021021210012 is a wasteful number, since it uses less digits than its factorization.

21021021210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776152409 (or 2776152407 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021021210012 its reverse (21001212012012), we get a palindrome (42022233222024).

The spelling of 21021021210012 in words is "twenty-one trillion, twenty-one billion, twenty-one million, two hundred ten thousand, twelve".