21002244231255 has 32 divisors (see below), whose sum is σ = 38404708360704. Its totient is φ = 9600874778496.

The previous prime is 21002244231197. The next prime is 21002244231257. The reversal of 21002244231255 is 55213244220012.

It is not a de Polignac number, because 21002244231255 - 2⁹ = 21002244230743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002244231257) 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, 5267452 + ... + 8351678.

It is an arithmetic number, because the mean of its divisors is an integer number (1200147136272).

Almost surely, 2^{21002244231255} is an apocalyptic number.

21002244231255 is a deficient number, since it is larger than the sum of its proper divisors (17402464129449).

21002244231255 is a wasteful number, since it uses less digits than its factorization.

21002244231255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149095.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 21002244231255 its reverse (55213244220012), we get a palindrome (76215488451267).

The spelling of 21002244231255 in words is "twenty-one trillion, two billion, two hundred forty-four million, two hundred thirty-one thousand, two hundred fifty-five".