21122212200021 has 12 divisors (see below), whose sum is σ = 30514095525472. Its totient is φ = 14079520895976.

The previous prime is 21122212199947. The next prime is 21122212200143. The reversal of 21122212200021 is 12000221222112.

It is a happy number.

21122212200021 is a `hidden beast` number, since 211 + 22 + 212 + 200 + 0 + 21 = 666.

It is not a de Polignac number, because 21122212200021 - 2³⁹ = 20572456386133 is a prime.

It is a super-2 number, since 2×21122212200021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122212199967 and 21122212200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122212200721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162756871 + ... + 162886596.

Almost surely, 2^{21122212200021} is an apocalyptic number.

It is an amenable number.

21122212200021 is a deficient number, since it is larger than the sum of its proper divisors (9391883325451).

21122212200021 is a wasteful number, since it uses less digits than its factorization.

21122212200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325650680 (or 325650677 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21122212200021 its reverse (12000221222112), we get a palindrome (33122433422133).

The spelling of 21122212200021 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twelve million, two hundred thousand, twenty-one".