21213612443060 has 24 divisors (see below), whose sum is σ = 44549292369960. Its totient is φ = 8485310455424.

The previous prime is 21213612443057. The next prime is 21213612443129. The reversal of 21213612443060 is 6034421631212.

It can be written as a sum of positive squares in 4 ways, for example, as 3479584144 + 21210132858916 = 58988^2 + 4605446^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21213612443060.

It is a congruent number.

It is an unprimeable number.

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, 7109615 + ... + 9642294.

It is an arithmetic number, because the mean of its divisors is an integer number (1856220515415).

Almost surely, 2^{21213612443060} is an apocalyptic number.

21213612443060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213612443060 is an abundant number, since it is smaller than the sum of its proper divisors (23335679926900).

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

21213612443060 is a wasteful number, since it uses less digits than its factorization.

21213612443060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16815235 (or 16815233 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 21213612443060 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, four hundred forty-three thousand, sixty".