1255521321001 has 16 divisors (see below), whose sum is σ = 1334609958528. Its totient is φ = 1177015507200.

The previous prime is 1255521320987. The next prime is 1255521321011. The reversal of 1255521321001 is 1001231255521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1255521321001 - 2⁵ = 1255521320969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255521321011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45326566 + ... + 45354256.

It is an arithmetic number, because the mean of its divisors is an integer number (83413122408).

Almost surely, 2^{1255521321001} is an apocalyptic number.

It is an amenable number.

1255521321001 is a deficient number, since it is larger than the sum of its proper divisors (79088637527).

1255521321001 is a wasteful number, since it uses less digits than its factorization.

1255521321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38112.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 1255521321001 its reverse (1001231255521), we get a palindrome (2256752576522).

The spelling of 1255521321001 in words is "one trillion, two hundred fifty-five billion, five hundred twenty-one million, three hundred twenty-one thousand, one".