21342223221 has 16 divisors (see below), whose sum is σ = 31628957760. Its totient is φ = 12690629120.

The previous prime is 21342223213. The next prime is 21342223237. The reversal of 21342223221 is 12232224312.

It is a cyclic number.

It is not a de Polignac number, because 21342223221 - 2³ = 21342223213 is a prime.

It is a super-2 number, since 2×21342223221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21342223191 and 21342223200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342223211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6099516 + ... + 6103013.

It is an arithmetic number, because the mean of its divisors is an integer number (1976809860).

Almost surely, 2^21342223221 is an apocalyptic number.

It is an amenable number.

21342223221 is a deficient number, since it is larger than the sum of its proper divisors (10286734539).

21342223221 is a wasteful number, since it uses less digits than its factorization.

21342223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12202596.

The product of its digits is 2304, while the sum is 24.

Adding to 21342223221 its reverse (12232224312), we get a palindrome (33574447533).

The spelling of 21342223221 in words is "twenty-one billion, three hundred forty-two million, two hundred twenty-three thousand, two hundred twenty-one".