21144014221 has 16 divisors (see below), whose sum is σ = 23576813568. Its totient is φ = 18797007600.

The previous prime is 21144014209. The next prime is 21144014233. The reversal of 21144014221 is 12241044112.

It is an interprime number because it is at equal distance from previous prime (21144014209) and next prime (21144014233).

It is a cyclic number.

It is not a de Polignac number, because 21144014221 - 2⁵ = 21144014189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21144014192 and 21144014201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144014201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619816 + ... + 653038.

It is an arithmetic number, because the mean of its divisors is an integer number (1473550848).

Almost surely, 2^21144014221 is an apocalyptic number.

It is an amenable number.

21144014221 is a deficient number, since it is larger than the sum of its proper divisors (2432799347).

21144014221 is a wasteful number, since it uses less digits than its factorization.

21144014221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34512.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21144014221 its reverse (12241044112), we get a palindrome (33385058333).

The spelling of 21144014221 in words is "twenty-one billion, one hundred forty-four million, fourteen thousand, two hundred twenty-one".