21222726148 has 24 divisors (see below), whose sum is σ = 40544583128. Its totient is φ = 9660923136.

The previous prime is 21222726143. The next prime is 21222726149. The reversal of 21222726148 is 84162722212.

It can be written as a sum of positive squares in 4 ways, for example, as 1799286724 + 19423439424 = 42418^2 + 139368^2 .

It is not an unprimeable number, because it can be changed into a prime (21222726143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2791611 + ... + 2799202.

Almost surely, 2^21222726148 is an apocalyptic number.

It is an amenable number.

21222726148 is a deficient number, since it is larger than the sum of its proper divisors (19321856980).

21222726148 is a wasteful number, since it uses less digits than its factorization.

21222726148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5590903 (or 5590901 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The spelling of 21222726148 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-six thousand, one hundred forty-eight".