21220112012021 has 8 divisors (see below), whose sum is σ = 22980095520480. Its totient is φ = 19478366674992.

The previous prime is 21220112011993. The next prime is 21220112012059. The reversal of 21220112012021 is 12021021102212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220112012021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220112012221) 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, 4559540435 + ... + 4559545088.

It is an arithmetic number, because the mean of its divisors is an integer number (2872511940060).

Almost surely, 2^{21220112012021} is an apocalyptic number.

It is an amenable number.

21220112012021 is a deficient number, since it is larger than the sum of its proper divisors (1759983508459).

21220112012021 is a wasteful number, since it uses less digits than its factorization.

21220112012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119085715.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220112012021 its reverse (12021021102212), we get a palindrome (33241133114233).

The spelling of 21220112012021 in words is "twenty-one trillion, two hundred twenty billion, one hundred twelve million, twelve thousand, twenty-one".