21227211167 has 4 divisors (see below), whose sum is σ = 21229181856. Its totient is φ = 21225240480.

The previous prime is 21227211163. The next prime is 21227211191. The reversal of 21227211167 is 76111272212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21227211167 - 2² = 21227211163 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 (21227211163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969098 + ... + 990759.

It is an arithmetic number, because the mean of its divisors is an integer number (5307295464).

Almost surely, 2^21227211167 is an apocalyptic number.

21227211167 is a deficient number, since it is larger than the sum of its proper divisors (1970689).

21227211167 is a wasteful number, since it uses less digits than its factorization.

21227211167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970688.

The product of its digits is 4704, while the sum is 32.

Adding to 21227211167 its reverse (76111272212), we get a palindrome (97338483379).

The spelling of 21227211167 in words is "twenty-one billion, two hundred twenty-seven million, two hundred eleven thousand, one hundred sixty-seven".