21271402163 has 8 divisors (see below), whose sum is σ = 23358844416. Its totient is φ = 19209573000.

The previous prime is 21271402129. The next prime is 21271402169. The reversal of 21271402163 is 36120417212.

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 21271402163 - 2¹⁸ = 21271140019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21271402169) 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, 6401531 + ... + 6404852.

It is an arithmetic number, because the mean of its divisors is an integer number (2919855552).

Almost surely, 2^21271402163 is an apocalyptic number.

21271402163 is a deficient number, since it is larger than the sum of its proper divisors (2087442253).

21271402163 is a wasteful number, since it uses less digits than its factorization.

21271402163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12806545.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 21271402163 its reverse (36120417212), we get a palindrome (57391819375).

The spelling of 21271402163 in words is "twenty-one billion, two hundred seventy-one million, four hundred two thousand, one hundred sixty-three".