21525770234455 has 8 divisors (see below), whose sum is σ = 25833160600704. Its totient is φ = 17219125308000.

The previous prime is 21525770234429. The next prime is 21525770234461. The reversal of 21525770234455 is 55443207752512.

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

It is not a de Polignac number, because 21525770234455 - 2¹⁹ = 21525769710167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186296416 + ... + 186411925.

It is an arithmetic number, because the mean of its divisors is an integer number (3229145075088).

Almost surely, 2^{21525770234455} is an apocalyptic number.

21525770234455 is a deficient number, since it is larger than the sum of its proper divisors (4307390366249).

21525770234455 is a wasteful number, since it uses less digits than its factorization.

21525770234455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372719897.

The product of its (nonzero) digits is 11760000, while the sum is 52.

Adding to 21525770234455 its reverse (55443207752512), we get a palindrome (76968977986967).

The spelling of 21525770234455 in words is "twenty-one trillion, five hundred twenty-five billion, seven hundred seventy million, two hundred thirty-four thousand, four hundred fifty-five".