1021323115255 has 4 divisors (see below), whose sum is σ = 1225587738312. Its totient is φ = 817058492200.

The previous prime is 1021323115247. The next prime is 1021323115273. The reversal of 1021323115255 is 5525113231201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1021323115255 - 2³ = 1021323115247 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 3 ways as a sum of consecutive naturals, for example, 102132311521 + ... + 102132311530.

It is an arithmetic number, because the mean of its divisors is an integer number (306396934578).

Almost surely, 2^{1021323115255} is an apocalyptic number.

1021323115255 is a deficient number, since it is larger than the sum of its proper divisors (204264623057).

1021323115255 is an equidigital number, since it uses as much as digits as its factorization.

1021323115255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204264623056.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 1021323115255 its reverse (5525113231201), we get a palindrome (6546436346456).

The spelling of 1021323115255 in words is "one trillion, twenty-one billion, three hundred twenty-three million, one hundred fifteen thousand, two hundred fifty-five".