21700395 has 12 divisors (see below), whose sum is σ = 37614096. Its totient is φ = 11573520.

The previous prime is 21700391. The next prime is 21700409. The reversal of 21700395 is 59300712.

It is not a de Polignac number, because 21700395 - 2² = 21700391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21700391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241071 + ... + 241160.

It is an arithmetic number, because the mean of its divisors is an integer number (3134508).

Almost surely, 2^21700395 is an apocalyptic number.

21700395 is a deficient number, since it is larger than the sum of its proper divisors (15913701).

21700395 is a wasteful number, since it uses less digits than its factorization.

21700395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482242 (or 482239 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 21700395 is about 4658.3682765535. The cubic root of 21700395 is about 278.9261376139.

The spelling of 21700395 in words is "twenty-one million, seven hundred thousand, three hundred ninety-five".