1311455538021 has 8 divisors (see below), whose sum is σ = 1851466641984. Its totient is φ = 822874063040.

The previous prime is 1311455537983. The next prime is 1311455538037. The reversal of 1311455538021 is 1208355541131.

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 1311455538021 - 2¹⁸ = 1311455275877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311455538221) 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, 12857407185 + ... + 12857407286.

It is an arithmetic number, because the mean of its divisors is an integer number (231433330248).

Almost surely, 2^{1311455538021} is an apocalyptic number.

It is an amenable number.

1311455538021 is a deficient number, since it is larger than the sum of its proper divisors (540011103963).

1311455538021 is a wasteful number, since it uses less digits than its factorization.

1311455538021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25714814491.

The product of its (nonzero) digits is 72000, while the sum is 39.

The spelling of 1311455538021 in words is "one trillion, three hundred eleven billion, four hundred fifty-five million, five hundred thirty-eight thousand, twenty-one".