21227221064 has 64 divisors (see below), whose sum is σ = 45696960000. Its totient is φ = 9055484928.

The previous prime is 21227221061. The next prime is 21227221069. The reversal of 21227221064 is 46012272212.

It is not an unprimeable number, because it can be changed into a prime (21227221061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16467332 + ... + 16468620.

It is an arithmetic number, because the mean of its divisors is an integer number (714015000).

Almost surely, 2^21227221064 is an apocalyptic number.

It is an amenable number.

21227221064 is an abundant number, since it is smaller than the sum of its proper divisors (24469738936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21227221064 is a wasteful number, since it uses less digits than its factorization.

21227221064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430 (or 2426 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

Adding to 21227221064 its reverse (46012272212), we get a palindrome (67239493276).

The spelling of 21227221064 in words is "twenty-one billion, two hundred twenty-seven million, two hundred twenty-one thousand, sixty-four".