1421571286561 has 4 divisors (see below), whose sum is σ = 1421658897300. Its totient is φ = 1421483675824.

The previous prime is 1421571286559. The next prime is 1421571286567. The reversal of 1421571286561 is 1656821751241.

It is a happy number.

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 629015541025 + 792555745536 = 793105^2 + 890256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421571286561 - 2¹ = 1421571286559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421571286567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43781026 + ... + 43813483.

It is an arithmetic number, because the mean of its divisors is an integer number (355414724325).

Almost surely, 2^{1421571286561} is an apocalyptic number.

It is an amenable number.

1421571286561 is a deficient number, since it is larger than the sum of its proper divisors (87610739).

1421571286561 is an equidigital number, since it uses as much as digits as its factorization.

1421571286561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87610738.

The product of its digits is 806400, while the sum is 49.

The spelling of 1421571286561 in words is "one trillion, four hundred twenty-one billion, five hundred seventy-one million, two hundred eighty-six thousand, five hundred sixty-one".