1316206651221 has 144 divisors (see below), whose sum is σ = 2502225872640. Its totient is φ = 658475516160.

The previous prime is 1316206651219. The next prime is 1316206651241. The reversal of 1316206651221 is 1221566026131.

1316206651221 is a `hidden beast` number, since 1 + 3 + 1 + 62 + 0 + 66 + 512 + 21 = 666.

It is not a de Polignac number, because 1316206651221 - 2¹ = 1316206651219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316206651241) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 55837780 + ... + 55861346.

It is an arithmetic number, because the mean of its divisors is an integer number (17376568560).

Almost surely, 2^{1316206651221} is an apocalyptic number.

1316206651221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1316206651221 is a deficient number, since it is larger than the sum of its proper divisors (1186019221419).

1316206651221 is a wasteful number, since it uses less digits than its factorization.

1316206651221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24024 (or 24014 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 1316206651221 in words is "one trillion, three hundred sixteen billion, two hundred six million, six hundred fifty-one thousand, two hundred twenty-one".