21392027 has 8 divisors (see below), whose sum is σ = 21958464. Its totient is φ = 20828808.

The previous prime is 21392023. The next prime is 21392051. The reversal of 21392027 is 72029312.

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 21392027 - 2² = 21392023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21391987 and 21392005.

It is not an unprimeable number, because it can be changed into a prime (21392023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18488 + ... + 19610.

It is an arithmetic number, because the mean of its divisors is an integer number (2744808).

Almost surely, 2^21392027 is an apocalyptic number.

21392027 is a deficient number, since it is larger than the sum of its proper divisors (566437).

21392027 is a wasteful number, since it uses less digits than its factorization.

21392027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21392027 is about 4625.1515650841. The cubic root of 21392027 is about 277.5986263071.

The spelling of 21392027 in words is "twenty-one million, three hundred ninety-two thousand, twenty-seven".