21212313013021 has 64 divisors (see below), whose sum is σ = 25432461250560. Its totient is φ = 17492851031040.

The previous prime is 21212313013009. The next prime is 21212313013027. The reversal of 21212313013021 is 12031031321212.

It is a de Polignac number, because none of the positive numbers 2^k-21212313013021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212313012983 and 21212313013001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212313013027) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1980417856 + ... + 1980428566.

It is an arithmetic number, because the mean of its divisors is an integer number (397382207040).

Almost surely, 2^{21212313013021} is an apocalyptic number.

It is an amenable number.

21212313013021 is a deficient number, since it is larger than the sum of its proper divisors (4220148237539).

21212313013021 is a wasteful number, since it uses less digits than its factorization.

21212313013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13706.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21212313013021 its reverse (12031031321212), we get a palindrome (33243344334233).

The spelling of 21212313013021 in words is "twenty-one trillion, two hundred twelve billion, three hundred thirteen million, thirteen thousand, twenty-one".