21226020163 has 8 divisors (see below), whose sum is σ = 21354300000. Its totient is φ = 21098101248.

The previous prime is 21226020161. The next prime is 21226020187. The reversal of 21226020163 is 36102062212.

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 21226020163 - 2¹ = 21226020161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226020161) 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, 28213 + ... + 207961.

It is an arithmetic number, because the mean of its divisors is an integer number (2669287500).

Almost surely, 2^21226020163 is an apocalyptic number.

21226020163 is a deficient number, since it is larger than the sum of its proper divisors (128279837).

21226020163 is a wasteful number, since it uses less digits than its factorization.

21226020163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180461.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21226020163 its reverse (36102062212), we get a palindrome (57328082375).

The spelling of 21226020163 in words is "twenty-one billion, two hundred twenty-six million, twenty thousand, one hundred sixty-three".