21478883 has 2 divisors, whose sum is σ = 21478884. Its totient is φ = 21478882.

The previous prime is 21478867. The next prime is 21478901. The reversal of 21478883 is 38887412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21478883 - 2⁴ = 21478867 is a prime.

It is a super-2 number, since 2×21478883² = 922684829855378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21478883.

It is not a weakly prime, because it can be changed into another prime (21478783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10739441 + 10739442.

It is an arithmetic number, because the mean of its divisors is an integer number (10739442).

Almost surely, 2^21478883 is an apocalyptic number.

21478883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21478883 is an equidigital number, since it uses as much as digits as its factorization.

21478883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 41.

The square root of 21478883 is about 4634.5315836663. The cubic root of 21478883 is about 277.9738213535.

It can be divided in two parts, 214 and 78883, that added together give a palindrome (79097).

The spelling of 21478883 in words is "twenty-one million, four hundred seventy-eight thousand, eight hundred eighty-three".