21221219332 has 12 divisors (see below), whose sum is σ = 37291231516. Its totient is φ = 10566581760.

The previous prime is 21221219317. The next prime is 21221219333. The reversal of 21221219332 is 23391212212.

It can be written as a sum of positive squares in 2 ways, for example, as 16183910656 + 5037308676 = 127216^2 + 70974^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21221219332.

It is not an unprimeable number, because it can be changed into a prime (21221219333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11005893 + ... + 11007820.

Almost surely, 2^21221219332 is an apocalyptic number.

It is an amenable number.

21221219332 is a deficient number, since it is larger than the sum of its proper divisors (16070012184).

21221219332 is a wasteful number, since it uses less digits than its factorization.

21221219332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22013958 (or 22013956 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The spelling of 21221219332 in words is "twenty-one billion, two hundred twenty-one million, two hundred nineteen thousand, three hundred thirty-two".