21226021545 has 8 divisors (see below), whose sum is σ = 33961634496. Its totient is φ = 11320544816.

The previous prime is 21226021541. The next prime is 21226021561. The reversal of 21226021545 is 54512062212.

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

It is a cyclic number.

It is not a de Polignac number, because 21226021545 - 2² = 21226021541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21226021541) 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, 707534037 + ... + 707534066.

It is an arithmetic number, because the mean of its divisors is an integer number (4245204312).

Almost surely, 2^21226021545 is an apocalyptic number.

It is an amenable number.

21226021545 is a deficient number, since it is larger than the sum of its proper divisors (12735612951).

21226021545 is a wasteful number, since it uses less digits than its factorization.

21226021545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415068111.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21226021545 its reverse (54512062212), we get a palindrome (75738083757).

The spelling of 21226021545 in words is "twenty-one billion, two hundred twenty-six million, twenty-one thousand, five hundred forty-five".