21378298379 has 4 divisors (see below), whose sum is σ = 21389005584. Its totient is φ = 21367591176.

The previous prime is 21378298373. The next prime is 21378298423. The reversal of 21378298379 is 97389287312.

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 21378298379 - 2¹² = 21378294283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21378298373) 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, 5350607 + ... + 5354600.

It is an arithmetic number, because the mean of its divisors is an integer number (5347251396).

Almost surely, 2^21378298379 is an apocalyptic number.

21378298379 is a deficient number, since it is larger than the sum of its proper divisors (10707205).

21378298379 is a wasteful number, since it uses less digits than its factorization.

21378298379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10707204.

The product of its digits is 9144576, while the sum is 59.

The spelling of 21378298379 in words is "twenty-one billion, three hundred seventy-eight million, two hundred ninety-eight thousand, three hundred seventy-nine".