21452878387 has 8 divisors (see below), whose sum is σ = 21918286656. Its totient is φ = 20987843712.

The previous prime is 21452878367. The next prime is 21452878409. The reversal of 21452878387 is 78387825412.

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 21452878387 - 2¹⁵ = 21452845619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21452878367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24283 + ... + 208555.

It is an arithmetic number, because the mean of its divisors is an integer number (2739785832).

Almost surely, 2^21452878387 is an apocalyptic number.

21452878387 is a deficient number, since it is larger than the sum of its proper divisors (465408269).

21452878387 is a wasteful number, since it uses less digits than its factorization.

21452878387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186797.

The product of its digits is 6021120, while the sum is 55.

The spelling of 21452878387 in words is "twenty-one billion, four hundred fifty-two million, eight hundred seventy-eight thousand, three hundred eighty-seven".