21254353 has 4 divisors (see below), whose sum is σ = 21349888. Its totient is φ = 21158820.

The previous prime is 21254329. The next prime is 21254371. The reversal of 21254353 is 35345212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21254353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21254383) 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, 47433 + ... + 47878.

It is an arithmetic number, because the mean of its divisors is an integer number (5337472).

Almost surely, 2^21254353 is an apocalyptic number.

It is an amenable number.

21254353 is a deficient number, since it is larger than the sum of its proper divisors (95535).

21254353 is an equidigital number, since it uses as much as digits as its factorization.

21254353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95534.

The product of its digits is 3600, while the sum is 25.

The square root of 21254353 is about 4610.2443536108. The cubic root of 21254353 is about 277.0018245915.

Adding to 21254353 its reverse (35345212), we get a palindrome (56599565).

The spelling of 21254353 in words is "twenty-one million, two hundred fifty-four thousand, three hundred fifty-three".