21403433414221 has 32 divisors (see below), whose sum is σ = 22545757099008. Its totient is φ = 20299446478080.

The previous prime is 21403433414213. The next prime is 21403433414239. The reversal of 21403433414221 is 12241433430412.

It is a cyclic number.

It is not a de Polignac number, because 21403433414221 - 2³ = 21403433414213 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 (21403433414261) 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 31 ways as a sum of consecutive naturals, for example, 1541693946 + ... + 1541707828.

It is an arithmetic number, because the mean of its divisors is an integer number (704554909344).

Almost surely, 2^{21403433414221} is an apocalyptic number.

It is an amenable number.

21403433414221 is a deficient number, since it is larger than the sum of its proper divisors (1142323684787).

21403433414221 is a wasteful number, since it uses less digits than its factorization.

21403433414221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21601.

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 21403433414221 its reverse (12241433430412), we get a palindrome (33644866844633).

The spelling of 21403433414221 in words is "twenty-one trillion, four hundred three billion, four hundred thirty-three million, four hundred fourteen thousand, two hundred twenty-one".