21880633 has 4 divisors (see below), whose sum is σ = 21933028. Its totient is φ = 21828240.

The previous prime is 21880591. The next prime is 21880643. The reversal of 21880633 is 33608812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1926544 + 19954089 = 1388^2 + 4467^2 .

It is a cyclic number.

It is not a de Polignac number, because 21880633 - 2⁹ = 21880121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21880595 and 21880604.

It is not an unprimeable number, because it can be changed into a prime (21880643) 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, 25566 + ... + 26407.

It is an arithmetic number, because the mean of its divisors is an integer number (5483257).

Almost surely, 2^21880633 is an apocalyptic number.

It is an amenable number.

21880633 is a deficient number, since it is larger than the sum of its proper divisors (52395).

21880633 is an equidigital number, since it uses as much as digits as its factorization.

21880633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52394.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21880633 is about 4677.6738877352. The cubic root of 21880633 is about 279.6962394593.

The spelling of 21880633 in words is "twenty-one million, eight hundred eighty thousand, six hundred thirty-three".