1023821121255 has 32 divisors (see below), whose sum is σ = 1740400516800. Its totient is φ = 512960136192.

The previous prime is 1023821121241. The next prime is 1023821121259. The reversal of 1023821121255 is 5521211283201.

It is a de Polignac number, because none of the positive numbers 2^k-1023821121255 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023821121259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31789470 + ... + 31821659.

It is an arithmetic number, because the mean of its divisors is an integer number (54387516150).

Almost surely, 2^{1023821121255} is an apocalyptic number.

1023821121255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1023821121255 is a deficient number, since it is larger than the sum of its proper divisors (716579395545).

1023821121255 is a wasteful number, since it uses less digits than its factorization.

1023821121255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63611203.

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 1023821121255 in words is "one trillion, twenty-three billion, eight hundred twenty-one million, one hundred twenty-one thousand, two hundred fifty-five".