21234695 has 4 divisors (see below), whose sum is σ = 25481640. Its totient is φ = 16987752.

The previous prime is 21234691. The next prime is 21234701. The reversal of 21234695 is 59643212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21234695 - 2² = 21234691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123465 + ... + 2123474.

It is an arithmetic number, because the mean of its divisors is an integer number (6370410).

Almost surely, 2^21234695 is an apocalyptic number.

21234695 is a deficient number, since it is larger than the sum of its proper divisors (4246945).

21234695 is an equidigital number, since it uses as much as digits as its factorization.

21234695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246944.

The product of its digits is 12960, while the sum is 32.

The square root of 21234695 is about 4608.1118693018. Note that the first 3 decimals coincide. The cubic root of 21234695 is about 276.9163992435.

The spelling of 21234695 in words is "twenty-one million, two hundred thirty-four thousand, six hundred ninety-five".