11321221329987 has 4 divisors (see below), whose sum is σ = 15094961773320. Its totient is φ = 7547480886656.

The previous prime is 11321221329961. The next prime is 11321221329989. The reversal of 11321221329987 is 78992312212311.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11321221329987 - 2¹⁴ = 11321221313603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11321221329989) 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, 1886870221662 + ... + 1886870221667.

It is an arithmetic number, because the mean of its divisors is an integer number (3773740443330).

Almost surely, 2^{11321221329987} is an apocalyptic number.

11321221329987 is a deficient number, since it is larger than the sum of its proper divisors (3773740443333).

11321221329987 is an equidigital number, since it uses as much as digits as its factorization.

11321221329987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3773740443332.

The product of its digits is 653184, while the sum is 51.

The spelling of 11321221329987 in words is "eleven trillion, three hundred twenty-one billion, two hundred twenty-one million, three hundred twenty-nine thousand, nine hundred eighty-seven".