21860097 has 16 divisors (see below), whose sum is σ = 34759680. Its totient is φ = 11948112.

The previous prime is 21860077. The next prime is 21860099. The reversal of 21860097 is 79006812.

It is not a de Polignac number, because 21860097 - 2¹⁰ = 21859073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21860099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22147 + ... + 23112.

It is an arithmetic number, because the mean of its divisors is an integer number (2172480).

Almost surely, 2^21860097 is an apocalyptic number.

It is an amenable number.

21860097 is a deficient number, since it is larger than the sum of its proper divisors (12899583).

21860097 is a wasteful number, since it uses less digits than its factorization.

21860097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45292.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21860097 is about 4675.4782643062. The cubic root of 21860097 is about 279.6087093916.

The spelling of 21860097 in words is "twenty-one million, eight hundred sixty thousand, ninety-seven".