1321663535372 has 36 divisors (see below), whose sum is σ = 2396570958600. Its totient is φ = 637737082752.

The previous prime is 1321663535371. The next prime is 1321663535417. The reversal of 1321663535372 is 2735353661231.

It is not an unprimeable number, because it can be changed into a prime (1321663535371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6967448 + ... + 7154624.

Almost surely, 2^{1321663535372} is an apocalyptic number.

It is an amenable number.

1321663535372 is a deficient number, since it is larger than the sum of its proper divisors (1074907423228).

1321663535372 is a wasteful number, since it uses less digits than its factorization.

1321663535372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189338 (or 189307 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 47.

The spelling of 1321663535372 in words is "one trillion, three hundred twenty-one billion, six hundred sixty-three million, five hundred thirty-five thousand, three hundred seventy-two".