21241225545 has 8 divisors (see below), whose sum is σ = 33985960896. Its totient is φ = 11328653616.

The previous prime is 21241225519. The next prime is 21241225547. The reversal of 21241225545 is 54552214212.

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

It is not a de Polignac number, because 21241225545 - 2¹⁷ = 21241094473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21241225547) 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, 708040837 + ... + 708040866.

It is an arithmetic number, because the mean of its divisors is an integer number (4248245112).

Almost surely, 2^21241225545 is an apocalyptic number.

It is an amenable number.

21241225545 is a deficient number, since it is larger than the sum of its proper divisors (12744735351).

21241225545 is a wasteful number, since it uses less digits than its factorization.

21241225545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416081711.

The product of its digits is 32000, while the sum is 33.

Adding to 21241225545 its reverse (54552214212), we get a palindrome (75793439757).

The spelling of 21241225545 in words is "twenty-one billion, two hundred forty-one million, two hundred twenty-five thousand, five hundred forty-five".