21340414221 has 16 divisors (see below), whose sum is σ = 32698393728. Its totient is φ = 12127147200.

The previous prime is 21340414171. The next prime is 21340414241. The reversal of 21340414221 is 12241404312.

It is not a de Polignac number, because 21340414221 - 2⁶ = 21340414157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21340414191 and 21340414200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340414241) 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, 2803410 + ... + 2811011.

It is an arithmetic number, because the mean of its divisors is an integer number (2043649608).

Almost surely, 2^21340414221 is an apocalyptic number.

21340414221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21340414221 is a deficient number, since it is larger than the sum of its proper divisors (11357979507).

21340414221 is a wasteful number, since it uses less digits than its factorization.

21340414221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5614612.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21340414221 its reverse (12241404312), we get a palindrome (33581818533).

Subtracting from 21340414221 its reverse (12241404312), we obtain a palindrome (9099009909).

The spelling of 21340414221 in words is "twenty-one billion, three hundred forty million, four hundred fourteen thousand, two hundred twenty-one".