21457195 has 8 divisors (see below), whose sum is σ = 25985520. Its totient is φ = 17007840.

The previous prime is 21457193. The next prime is 21457199. The reversal of 21457195 is 59175412.

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

It is not a de Polignac number, because 21457195 - 2¹ = 21457193 is a prime.

It is a super-2 number, since 2×21457195² = 920822434536050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21457195.

It is not an unprimeable number, because it can be changed into a prime (21457193) 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, 19141 + ... + 20230.

It is an arithmetic number, because the mean of its divisors is an integer number (3248190).

Almost surely, 2^21457195 is an apocalyptic number.

21457195 is a deficient number, since it is larger than the sum of its proper divisors (4528325).

21457195 is a wasteful number, since it uses less digits than its factorization.

21457195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39485.

The product of its digits is 12600, while the sum is 34.

The square root of 21457195 is about 4632.1911661761. The cubic root of 21457195 is about 277.8802297934.

The spelling of 21457195 in words is "twenty-one million, four hundred fifty-seven thousand, one hundred ninety-five".