21392063 has 16 divisors (see below), whose sum is σ = 26778624. Its totient is φ = 16601760.

The previous prime is 21392057. The next prime is 21392071. The reversal of 21392063 is 36029312.

It is not a de Polignac number, because 21392063 - 2⁶ = 21391999 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27881 + ... + 28637.

It is an arithmetic number, because the mean of its divisors is an integer number (1673664).

Almost surely, 2^21392063 is an apocalyptic number.

21392063 is a deficient number, since it is larger than the sum of its proper divisors (5386561).

21392063 is a wasteful number, since it uses less digits than its factorization.

21392063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 21392063 is about 4625.1554568468. The cubic root of 21392063 is about 277.5987820278.

The spelling of 21392063 in words is "twenty-one million, three hundred ninety-two thousand, sixty-three".