21421695 has 8 divisors (see below), whose sum is σ = 34274736. Its totient is φ = 11424896.

The previous prime is 21421693. The next prime is 21421703. The reversal of 21421695 is 59612412.

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 21421695 - 2¹ = 21421693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714042 + ... + 714071.

It is an arithmetic number, because the mean of its divisors is an integer number (4284342).

Almost surely, 2^21421695 is an apocalyptic number.

21421695 is a deficient number, since it is larger than the sum of its proper divisors (12853041).

21421695 is a wasteful number, since it uses less digits than its factorization.

21421695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428121.

The product of its digits is 4320, while the sum is 30.

The square root of 21421695 is about 4628.3577000919. The cubic root of 21421695 is about 277.7268982663.

The spelling of 21421695 in words is "twenty-one million, four hundred twenty-one thousand, six hundred ninety-five".