21226021508 has 12 divisors (see below), whose sum is σ = 37528482012. Its totient is φ = 10503598080.

The previous prime is 21226021507. The next prime is 21226021541. The reversal of 21226021508 is 80512062212.

It can be written as a sum of positive squares in 2 ways, for example, as 13174907524 + 8051113984 = 114782^2 + 89728^2 .

It is not an unprimeable number, because it can be changed into a prime (21226021507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27352733 + ... + 27353508.

It is an arithmetic number, because the mean of its divisors is an integer number (3127373501).

Almost surely, 2^21226021508 is an apocalyptic number.

It is an amenable number.

21226021508 is a deficient number, since it is larger than the sum of its proper divisors (16302460504).

21226021508 is a wasteful number, since it uses less digits than its factorization.

21226021508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54706342 (or 54706340 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 21226021508 in words is "twenty-one billion, two hundred twenty-six million, twenty-one thousand, five hundred eight".