1255444644421 has 16 divisors (see below), whose sum is σ = 1383946820928. Its totient is φ = 1129341888000.

The previous prime is 1255444644409. The next prime is 1255444644449. The reversal of 1255444644421 is 1244464445521.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255444644421 is a prime.

It is a super-2 number, since 2×1255444644421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255444644451) 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, 5925511 + ... + 6133723.

It is an arithmetic number, because the mean of its divisors is an integer number (86496676308).

Almost surely, 2^{1255444644421} is an apocalyptic number.

1255444644421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1255444644421 is a deficient number, since it is larger than the sum of its proper divisors (128502176507).

1255444644421 is a wasteful number, since it uses less digits than its factorization.

1255444644421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213972.

The product of its digits is 2457600, while the sum is 46.

The spelling of 1255444644421 in words is "one trillion, two hundred fifty-five billion, four hundred forty-four million, six hundred forty-four thousand, four hundred twenty-one".