21839053 has 2 divisors, whose sum is σ = 21839054. Its totient is φ = 21839052.

The previous prime is 21839023. The next prime is 21839057. The reversal of 21839053 is 35093812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14645929 + 7193124 = 3827^2 + 2682^2 .

It is a cyclic number.

It is not a de Polignac number, because 21839053 - 2¹⁷ = 21707981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21839057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919526 + 10919527.

It is an arithmetic number, because the mean of its divisors is an integer number (10919527).

Almost surely, 2^21839053 is an apocalyptic number.

It is an amenable number.

21839053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21839053 is an equidigital number, since it uses as much as digits as its factorization.

21839053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 21839053 is about 4673.2272574742. The cubic root of 21839053 is about 279.5189572002.

It can be divided in two parts, 2183 and 9053, that added together give a square (11236 = 106²).

The spelling of 21839053 in words is "twenty-one million, eight hundred thirty-nine thousand, fifty-three".