21880897 has 4 divisors (see below), whose sum is σ = 22346496. Its totient is φ = 21415300.

The previous prime is 21880879. The next prime is 21880919. The reversal of 21880897 is 79808812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21880897 - 2¹¹ = 21878849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21880847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232729 + ... + 232822.

It is an arithmetic number, because the mean of its divisors is an integer number (5586624).

Almost surely, 2^21880897 is an apocalyptic number.

It is an amenable number.

21880897 is a deficient number, since it is larger than the sum of its proper divisors (465599).

21880897 is an equidigital number, since it uses as much as digits as its factorization.

21880897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465598.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 21880897 is about 4677.7021068042. The cubic root of 21880897 is about 279.6973643432.

The spelling of 21880897 in words is "twenty-one million, eight hundred eighty thousand, eight hundred ninety-seven".