1023440021255 has 8 divisors (see below), whose sum is σ = 1261320675072. Its totient is φ = 796623583968.

The previous prime is 1023440021249. The next prime is 1023440021269. The reversal of 1023440021255 is 5521200443201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1023440021255 - 2¹⁶ = 1023439955719 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 7 ways as a sum of consecutive naturals, for example, 2766053927 + ... + 2766054296.

It is an arithmetic number, because the mean of its divisors is an integer number (157665084384).

Almost surely, 2^{1023440021255} is an apocalyptic number.

1023440021255 is a deficient number, since it is larger than the sum of its proper divisors (237880653817).

1023440021255 is an equidigital number, since it uses as much as digits as its factorization.

1023440021255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532108265.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 1023440021255 its reverse (5521200443201), we get a palindrome (6544640464456).

The spelling of 1023440021255 in words is "one trillion, twenty-three billion, four hundred forty million, twenty-one thousand, two hundred fifty-five".