21222160724 has 12 divisors (see below), whose sum is σ = 37181821824. Its totient is φ = 10598783064.

The previous prime is 21222160721. The next prime is 21222160801. The reversal of 21222160724 is 42706122212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222160721) 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 3 ways as a sum of consecutive naturals, for example, 3070442 + ... + 3077345.

It is an arithmetic number, because the mean of its divisors is an integer number (3098485152).

Almost surely, 2^21222160724 is an apocalyptic number.

It is an amenable number.

21222160724 is a deficient number, since it is larger than the sum of its proper divisors (15959661100).

21222160724 is a wasteful number, since it uses less digits than its factorization.

21222160724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6148654 (or 6148652 counting only the distinct ones).

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

Adding to 21222160724 its reverse (42706122212), we get a palindrome (63928282936).

The spelling of 21222160724 in words is "twenty-one billion, two hundred twenty-two million, one hundred sixty thousand, seven hundred twenty-four".