21142063 has 4 divisors (see below), whose sum is σ = 21189600. Its totient is φ = 21094528.

The previous prime is 21142061. The next prime is 21142087. The reversal of 21142063 is 36024112.

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 21142063 - 2¹ = 21142061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21142063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142061) 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, 23095 + ... + 23992.

It is an arithmetic number, because the mean of its divisors is an integer number (5297400).

Almost surely, 2^21142063 is an apocalyptic number.

21142063 is a deficient number, since it is larger than the sum of its proper divisors (47537).

21142063 is an equidigital number, since it uses as much as digits as its factorization.

21142063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47536.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21142063 is about 4598.0499127347. The cubic root of 21142063 is about 276.5131486498.

Adding to 21142063 its reverse (36024112), we get a palindrome (57166175).

The spelling of 21142063 in words is "twenty-one million, one hundred forty-two thousand, sixty-three".