21226021539 has 8 divisors (see below), whose sum is σ = 28302456912. Its totient is φ = 14150133600.

The previous prime is 21226021507. The next prime is 21226021541. The reversal of 21226021539 is 93512062212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21226021539 - 2⁵ = 21226021507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21226021639) 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 7 ways as a sum of consecutive naturals, for example, 35704 + ... + 209109.

It is an arithmetic number, because the mean of its divisors is an integer number (3537807114).

Almost surely, 2^21226021539 is an apocalyptic number.

21226021539 is a deficient number, since it is larger than the sum of its proper divisors (7076435373).

21226021539 is a wasteful number, since it uses less digits than its factorization.

21226021539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273717.

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 21226021539 in words is "twenty-one billion, two hundred twenty-six million, twenty-one thousand, five hundred thirty-nine".