21440224455 has 32 divisors (see below), whose sum is σ = 37234089984. Its totient is φ = 10472063616.

The previous prime is 21440224451. The next prime is 21440224469. The reversal of 21440224455 is 55442204412.

It is not a de Polignac number, because 21440224455 - 2² = 21440224451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440224451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 408109 + ... + 457638.

It is an arithmetic number, because the mean of its divisors is an integer number (1163565312).

Almost surely, 2^21440224455 is an apocalyptic number.

21440224455 is a deficient number, since it is larger than the sum of its proper divisors (15793865529).

21440224455 is a wasteful number, since it uses less digits than its factorization.

21440224455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865895.

The product of its (nonzero) digits is 51200, while the sum is 33.

Adding to 21440224455 its reverse (55442204412), we get a palindrome (76882428867).

The spelling of 21440224455 in words is "twenty-one billion, four hundred forty million, two hundred twenty-four thousand, four hundred fifty-five".