21412243221 has 8 divisors (see below), whose sum is σ = 29157097344. Its totient is φ = 13971108960.

The previous prime is 21412243207. The next prime is 21412243253. The reversal of 21412243221 is 12234221412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21412243221 - 2¹¹ = 21412241173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21412243191 and 21412243200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412243421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75929800 + ... + 75930081.

It is an arithmetic number, because the mean of its divisors is an integer number (3644637168).

Almost surely, 2^21412243221 is an apocalyptic number.

It is an amenable number.

21412243221 is a deficient number, since it is larger than the sum of its proper divisors (7744854123).

21412243221 is a wasteful number, since it uses less digits than its factorization.

21412243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151859931.

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

Adding to 21412243221 its reverse (12234221412), we get a palindrome (33646464633).

The spelling of 21412243221 in words is "twenty-one billion, four hundred twelve million, two hundred forty-three thousand, two hundred twenty-one".