21524455455 has 8 divisors (see below), whose sum is σ = 34439128752. Its totient is φ = 11479709568.

The previous prime is 21524455451. The next prime is 21524455471. The reversal of 21524455455 is 55455442512.

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

It is not a de Polignac number, because 21524455455 - 2² = 21524455451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524455451) 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, 717481834 + ... + 717481863.

It is an arithmetic number, because the mean of its divisors is an integer number (4304891094).

Almost surely, 2^21524455455 is an apocalyptic number.

21524455455 is a deficient number, since it is larger than the sum of its proper divisors (12914673297).

21524455455 is a wasteful number, since it uses less digits than its factorization.

21524455455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434963705.

The product of its digits is 800000, while the sum is 42.

Adding to 21524455455 its reverse (55455442512), we get a palindrome (76979897967).

The spelling of 21524455455 in words is "twenty-one billion, five hundred twenty-four million, four hundred fifty-five thousand, four hundred fifty-five".