21134232221 has 8 divisors (see below), whose sum is σ = 21197299200. Its totient is φ = 21071217600.

The previous prime is 21134232191. The next prime is 21134232269. The reversal of 21134232221 is 12223243112.

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

It is a cyclic number.

It is not a de Polignac number, because 21134232221 - 2²² = 21130037917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134232281) 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, 886070 + ... + 909608.

It is an arithmetic number, because the mean of its divisors is an integer number (2649662400).

Almost surely, 2^21134232221 is an apocalyptic number.

It is an amenable number.

21134232221 is a deficient number, since it is larger than the sum of its proper divisors (63066979).

21134232221 is a wasteful number, since it uses less digits than its factorization.

21134232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26179.

The product of its digits is 1152, while the sum is 23.

Adding to 21134232221 its reverse (12223243112), we get a palindrome (33357475333).

The spelling of 21134232221 in words is "twenty-one billion, one hundred thirty-four million, two hundred thirty-two thousand, two hundred twenty-one".