21221408333449 has 16 divisors (see below), whose sum is σ = 21638961437184. Its totient is φ = 20807223091200.

The previous prime is 21221408333417. The next prime is 21221408333479. The reversal of 21221408333449 is 94433380412212.

It is a cyclic number.

It is not a de Polignac number, because 21221408333449 - 2⁵ = 21221408333417 is a prime.

It is a super-3 number, since 3×21221408333449³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221408333399 and 21221408333408.

It is not an unprimeable number, because it can be changed into a prime (21221408333479) 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 15 ways as a sum of consecutive naturals, for example, 41416192 + ... + 41925454.

It is an arithmetic number, because the mean of its divisors is an integer number (1352435089824).

Almost surely, 2^{21221408333449} is an apocalyptic number.

It is an amenable number.

21221408333449 is a deficient number, since it is larger than the sum of its proper divisors (417553103735).

21221408333449 is a wasteful number, since it uses less digits than its factorization.

21221408333449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512568.

The product of its (nonzero) digits is 995328, while the sum is 46.

The spelling of 21221408333449 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred eight million, three hundred thirty-three thousand, four hundred forty-nine".