1252421550405 has 12 divisors (see below), whose sum is σ = 2170864020780. Its totient is φ = 667958160192.

The previous prime is 1252421550379. The next prime is 1252421550407. The reversal of 1252421550405 is 5040551242521.

1252421550405 is a `hidden beast` number, since 1 + 2 + 5 + 242 + 1 + 5 + 5 + 0 + 405 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 290754973089 + 961666577316 = 539217^2 + 980646^2 .

It is not a de Polignac number, because 1252421550405 - 2¹² = 1252421546309 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1252421550405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252421550407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13915794960 + ... + 13915795049.

It is an arithmetic number, because the mean of its divisors is an integer number (180905335065).

Almost surely, 2^{1252421550405} is an apocalyptic number.

1252421550405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1252421550405 is a deficient number, since it is larger than the sum of its proper divisors (918442470375).

1252421550405 is a wasteful number, since it uses less digits than its factorization.

1252421550405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27831590020 (or 27831590017 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

Adding to 1252421550405 its reverse (5040551242521), we get a palindrome (6292972792926).

The spelling of 1252421550405 in words is "one trillion, two hundred fifty-two billion, four hundred twenty-one million, five hundred fifty thousand, four hundred five".