21243935 has 8 divisors (see below), whose sum is σ = 26085840. Its totient is φ = 16599744.

The previous prime is 21243913. The next prime is 21243941. The reversal of 21243935 is 53934212.

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

It is a cyclic number.

It is not a de Polignac number, because 21243935 - 2¹² = 21239839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21243898 and 21243907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49190 + ... + 49619.

It is an arithmetic number, because the mean of its divisors is an integer number (3260730).

Almost surely, 2^21243935 is an apocalyptic number.

21243935 is a deficient number, since it is larger than the sum of its proper divisors (4841905).

21243935 is an equidigital number, since it uses as much as digits as its factorization.

21243935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98857.

The product of its digits is 6480, while the sum is 29.

The square root of 21243935 is about 4609.1143400875. The cubic root of 21243935 is about 276.9565589363.

The spelling of 21243935 in words is "twenty-one million, two hundred forty-three thousand, nine hundred thirty-five".