21429895 has 8 divisors (see below), whose sum is σ = 25745904. Its totient is φ = 17123904.

The previous prime is 21429893. The next prime is 21429899. The reversal of 21429895 is 59892412.

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 21429895 - 2¹ = 21429893 is a prime.

It is a super-2 number, since 2×21429895² = 918480799422050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21429893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3532 + ... + 7438.

It is an arithmetic number, because the mean of its divisors is an integer number (3218238).

Almost surely, 2^21429895 is an apocalyptic number.

21429895 is a deficient number, since it is larger than the sum of its proper divisors (4316009).

21429895 is a wasteful number, since it uses less digits than its factorization.

21429895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5009.

The product of its digits is 51840, while the sum is 40.

The square root of 21429895 is about 4629.2434587090. The cubic root of 21429895 is about 277.7623307262.

The spelling of 21429895 in words is "twenty-one million, four hundred twenty-nine thousand, eight hundred ninety-five".