11421813987 has 12 divisors (see below), whose sum is σ = 17468656920. Its totient is φ = 7166628288.

The previous prime is 11421813971. The next prime is 11421814009. The reversal of 11421813987 is 78931812411.

It is a happy number.

11421813987 is a `hidden beast` number, since 11 + 421 + 8 + 139 + 87 = 666.

It is not a de Polignac number, because 11421813987 - 2⁴ = 11421813971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11421813187) 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, 37326037 + ... + 37326342.

It is an arithmetic number, because the mean of its divisors is an integer number (1455721410).

Almost surely, 2^11421813987 is an apocalyptic number.

11421813987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11421813987 is a deficient number, since it is larger than the sum of its proper divisors (6046842933).

11421813987 is a wasteful number, since it uses less digits than its factorization.

11421813987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74652402 (or 74652399 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The spelling of 11421813987 in words is "eleven billion, four hundred twenty-one million, eight hundred thirteen thousand, nine hundred eighty-seven".