1251421513445 has 16 divisors (see below), whose sum is σ = 1503665287920. Its totient is φ = 999831705600.

The previous prime is 1251421513387. The next prime is 1251421513513. The reversal of 1251421513445 is 5443151241521.

It can be written as a sum of positive squares in 8 ways, for example, as 178179384769 + 1073242128676 = 422113^2 + 1035974^2 .

It is not a de Polignac number, because 1251421513445 - 2³⁸ = 976543606501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1251421513399 and 1251421513408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12738815 + ... + 12836675.

It is an arithmetic number, because the mean of its divisors is an integer number (93979080495).

Almost surely, 2^{1251421513445} is an apocalyptic number.

It is an amenable number.

1251421513445 is a deficient number, since it is larger than the sum of its proper divisors (252243774475).

1251421513445 is a wasteful number, since it uses less digits than its factorization.

1251421513445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101176.

The product of its digits is 96000, while the sum is 38.

Adding to 1251421513445 its reverse (5443151241521), we get a palindrome (6694572754966).

The spelling of 1251421513445 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-one million, five hundred thirteen thousand, four hundred forty-five".