21272626064 has 80 divisors (see below), whose sum is σ = 43064815104. Its totient is φ = 10168166400.

The previous prime is 21272626061. The next prime is 21272626087. The reversal of 21272626064 is 46062627212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21272626061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27519182 + ... + 27519954.

Almost surely, 2^21272626064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21272626064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21532407552).

21272626064 is an abundant number, since it is smaller than the sum of its proper divisors (21792189040).

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

21272626064 is a wasteful number, since it uses less digits than its factorization.

21272626064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416 (or 1410 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 21272626064 in words is "twenty-one billion, two hundred seventy-two million, six hundred twenty-six thousand, sixty-four".