21387904414 has 8 divisors (see below), whose sum is σ = 32151149280. Its totient is φ = 10670854656.

The previous prime is 21387904409. The next prime is 21387904423. The reversal of 21387904414 is 41440978312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11547619 + ... + 11549470.

It is an arithmetic number, because the mean of its divisors is an integer number (4018893660).

Almost surely, 2^21387904414 is an apocalyptic number.

21387904414 is a deficient number, since it is larger than the sum of its proper divisors (10763244866).

21387904414 is a wasteful number, since it uses less digits than its factorization.

21387904414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23097554.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 21387904414 in words is "twenty-one billion, three hundred eighty-seven million, nine hundred four thousand, four hundred fourteen".