21797195 has 8 divisors (see below), whose sum is σ = 29893344. Its totient is φ = 14946624.

The previous prime is 21797189. The next prime is 21797197. The reversal of 21797195 is 59179712.

It is a happy number.

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

It is not a de Polignac number, because 21797195 - 2⁶ = 21797131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21797197) 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, 311354 + ... + 311423.

It is an arithmetic number, because the mean of its divisors is an integer number (3736668).

Almost surely, 2^21797195 is an apocalyptic number.

21797195 is a deficient number, since it is larger than the sum of its proper divisors (8096149).

21797195 is an equidigital number, since it uses as much as digits as its factorization.

21797195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622789.

The product of its digits is 39690, while the sum is 41.

The square root of 21797195 is about 4668.7466198114. The cubic root of 21797195 is about 279.3402622187.

The spelling of 21797195 in words is "twenty-one million, seven hundred ninety-seven thousand, one hundred ninety-five".