21327278 has 8 divisors (see below), whose sum is σ = 36561072. Its totient is φ = 9140256.

The previous prime is 21327263. The next prime is 21327289. The reversal of 21327278 is 87272312.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761675 + ... + 761702.

It is an arithmetic number, because the mean of its divisors is an integer number (4570134).

Almost surely, 2^21327278 is an apocalyptic number.

21327278 is a deficient number, since it is larger than the sum of its proper divisors (15233794).

21327278 is a wasteful number, since it uses less digits than its factorization.

21327278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523386.

The product of its digits is 9408, while the sum is 32.

The square root of 21327278 is about 4618.1465979330. The cubic root of 21327278 is about 277.3182664219.

The spelling of 21327278 in words is "twenty-one million, three hundred twenty-seven thousand, two hundred seventy-eight".