21322005255 has 24 divisors (see below), whose sum is σ = 36983381760. Its totient is φ = 11363970240.

The previous prime is 21322005253. The next prime is 21322005259. The reversal of 21322005255 is 55250022312.

21322005255 is a `hidden beast` number, since 2 + 132 + 2 + 0 + 0 + 525 + 5 = 666.

It is not a de Polignac number, because 21322005255 - 2¹ = 21322005253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322005253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94860 + ... + 227249.

It is an arithmetic number, because the mean of its divisors is an integer number (1540974240).

Almost surely, 2^21322005255 is an apocalyptic number.

21322005255 is a deficient number, since it is larger than the sum of its proper divisors (15661376505).

21322005255 is a wasteful number, since it uses less digits than its factorization.

21322005255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323591 (or 323588 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 21322005255 its reverse (55250022312), we get a palindrome (76572027567).

The spelling of 21322005255 in words is "twenty-one billion, three hundred twenty-two million, five thousand, two hundred fifty-five".