21141243221 has 8 divisors (see below), whose sum is σ = 24247406784. Its totient is φ = 18056576160.

The previous prime is 21141243203. The next prime is 21141243229. The reversal of 21141243221 is 12234214112.

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

It is not a de Polignac number, because 21141243221 - 2²² = 21137048917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141243229) 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, 5372015 + ... + 5375948.

It is an arithmetic number, because the mean of its divisors is an integer number (3030925848).

Almost surely, 2^21141243221 is an apocalyptic number.

It is an amenable number.

21141243221 is a deficient number, since it is larger than the sum of its proper divisors (3106163563).

21141243221 is a wasteful number, since it uses less digits than its factorization.

21141243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10748251.

The product of its digits is 768, while the sum is 23.

Adding to 21141243221 its reverse (12234214112), we get a palindrome (33375457333).

The spelling of 21141243221 in words is "twenty-one billion, one hundred forty-one million, two hundred forty-three thousand, two hundred twenty-one".