21830253 has 8 divisors (see below), whose sum is σ = 29584416. Its totient is φ = 14314800.

The previous prime is 21830251. The next prime is 21830257. The reversal of 21830253 is 35203812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21830253 - 2¹ = 21830251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21830251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59463 + ... + 59828.

It is an arithmetic number, because the mean of its divisors is an integer number (3698052).

Almost surely, 2^21830253 is an apocalyptic number.

It is an amenable number.

21830253 is a deficient number, since it is larger than the sum of its proper divisors (7754163).

21830253 is a wasteful number, since it uses less digits than its factorization.

21830253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119355.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21830253 is about 4672.2856291113. The cubic root of 21830253 is about 279.4814082997.

The spelling of 21830253 in words is "twenty-one million, eight hundred thirty thousand, two hundred fifty-three".