21225732764 has 12 divisors (see below), whose sum is σ = 37168567800. Its totient is φ = 10606141968.

The previous prime is 21225732763. The next prime is 21225732779. The reversal of 21225732764 is 46723752212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225732763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1673999 + ... + 1686630.

It is an arithmetic number, because the mean of its divisors is an integer number (3097380650).

Almost surely, 2^21225732764 is an apocalyptic number.

It is an amenable number.

21225732764 is a deficient number, since it is larger than the sum of its proper divisors (15942835036).

21225732764 is a wasteful number, since it uses less digits than its factorization.

21225732764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3362212 (or 3362210 counting only the distinct ones).

The product of its digits is 282240, while the sum is 41.

The spelling of 21225732764 in words is "twenty-one billion, two hundred twenty-five million, seven hundred thirty-two thousand, seven hundred sixty-four".