21000212223321 has 24 divisors (see below), whose sum is σ = 28795529179200. Its totient is φ = 13613225435712.

The previous prime is 21000212223293. The next prime is 21000212223323. The reversal of 21000212223321 is 12332221200012.

It is not a de Polignac number, because 21000212223321 - 2²¹ = 21000210126169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000212223323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4957980 + ... + 8159778.

It is an arithmetic number, because the mean of its divisors is an integer number (1199813715800).

Almost surely, 2^{21000212223321} is an apocalyptic number.

It is an amenable number.

21000212223321 is a deficient number, since it is larger than the sum of its proper divisors (7795316955879).

21000212223321 is a wasteful number, since it uses less digits than its factorization.

21000212223321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203473 (or 3203436 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21000212223321 its reverse (12332221200012), we get a palindrome (33332433423333).

The spelling of 21000212223321 in words is "twenty-one trillion, two hundred twelve million, two hundred twenty-three thousand, three hundred twenty-one".