21182212387 has 8 divisors (see below), whose sum is σ = 24219881216. Its totient is φ = 18147453192.

The previous prime is 21182212379. The next prime is 21182212417. The reversal of 21182212387 is 78321228112.

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 21182212387 - 2³ = 21182212379 is a prime.

It is a super-2 number, since 2×21182212387² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21182212367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711783 + ... + 740944.

It is an arithmetic number, because the mean of its divisors is an integer number (3027485152).

Almost surely, 2^21182212387 is an apocalyptic number.

21182212387 is a deficient number, since it is larger than the sum of its proper divisors (3037668829).

21182212387 is a wasteful number, since it uses less digits than its factorization.

21182212387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454817.

The product of its digits is 21504, while the sum is 37.

The spelling of 21182212387 in words is "twenty-one billion, one hundred eighty-two million, two hundred twelve thousand, three hundred eighty-seven".