21740195 has 8 divisors (see below), whose sum is σ = 27622944. Its totient is φ = 16369024.

The previous prime is 21740141. The next prime is 21740197. The reversal of 21740195 is 59104712.

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 21740195 - 2¹⁶ = 21674659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21740197) 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, 127799 + ... + 127968.

It is an arithmetic number, because the mean of its divisors is an integer number (3452868).

Almost surely, 2^21740195 is an apocalyptic number.

21740195 is a deficient number, since it is larger than the sum of its proper divisors (5882749).

21740195 is a wasteful number, since it uses less digits than its factorization.

21740195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255789.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21740195 is about 4662.6382017051. The cubic root of 21740195 is about 279.0965566372.

The spelling of 21740195 in words is "twenty-one million, seven hundred forty thousand, one hundred ninety-five".