1245520255421 has 8 divisors (see below), whose sum is σ = 1342379899224. Its totient is φ = 1148810667840.

The previous prime is 1245520255393. The next prime is 1245520255429.

1245520255421 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 154811558521 + 1090708696900 = 393461^2 + 1044370^2 .

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 1245520255421 - 2²² = 1245516061117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245520255429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37496810 + ... + 37530011.

It is an arithmetic number, because the mean of its divisors is an integer number (167797487403).

Almost surely, 2^{1245520255421} is an apocalyptic number.

It is an amenable number.

1245520255421 is a deficient number, since it is larger than the sum of its proper divisors (96859643803).

1245520255421 is a wasteful number, since it uses less digits than its factorization.

1245520255421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75028111.

The product of its (nonzero) digits is 160000, while the sum is 38.

The spelling of 1245520255421 in words is "one trillion, two hundred forty-five billion, five hundred twenty million, two hundred fifty-five thousand, four hundred twenty-one".