21314394278 has 4 divisors (see below), whose sum is σ = 31971591420. Its totient is φ = 10657197138.

The previous prime is 21314394259. The next prime is 21314394293. The reversal of 21314394278 is 87249341312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328598568 + ... + 5328598571.

It is an arithmetic number, because the mean of its divisors is an integer number (7992897855).

Almost surely, 2^21314394278 is an apocalyptic number.

21314394278 is a deficient number, since it is larger than the sum of its proper divisors (10657197142).

21314394278 is a wasteful number, since it uses less digits than its factorization.

21314394278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10657197141.

The product of its digits is 290304, while the sum is 44.

The spelling of 21314394278 in words is "twenty-one billion, three hundred fourteen million, three hundred ninety-four thousand, two hundred seventy-eight".