1312500251021 has 4 divisors (see below), whose sum is σ = 1313900999292. Its totient is φ = 1311099502752.

The previous prime is 1312500251003. The next prime is 1312500251089. The reversal of 1312500251021 is 1201520052131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18227700100 + 1294272550921 = 135010^2 + 1137661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312500251021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312500250021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700372730 + ... + 700374603.

It is an arithmetic number, because the mean of its divisors is an integer number (328475249823).

Almost surely, 2^{1312500251021} is an apocalyptic number.

It is an amenable number.

1312500251021 is a deficient number, since it is larger than the sum of its proper divisors (1400748271).

1312500251021 is an equidigital number, since it uses as much as digits as its factorization.

1312500251021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400748270.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 1312500251021 in words is "one trillion, three hundred twelve billion, five hundred million, two hundred fifty-one thousand, twenty-one".