21427053 has 16 divisors (see below), whose sum is σ = 29984640. Its totient is φ = 13584384.

The previous prime is 21427039. The next prime is 21427073. The reversal of 21427053 is 35072412.

It is not a de Polignac number, because 21427053 - 2⁴ = 21427037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21427013) 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, 12513 + ... + 14121.

It is an arithmetic number, because the mean of its divisors is an integer number (1874040).

Almost surely, 2^21427053 is an apocalyptic number.

21427053 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21427053 is a deficient number, since it is larger than the sum of its proper divisors (8557587).

21427053 is a wasteful number, since it uses less digits than its factorization.

21427053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21427053 is about 4628.9364869266. The cubic root of 21427053 is about 277.7500513778.

Adding to 21427053 its reverse (35072412), we get a palindrome (56499465).

The spelling of 21427053 in words is "twenty-one million, four hundred twenty-seven thousand, fifty-three".