21396883 has 2 divisors, whose sum is σ = 21396884. Its totient is φ = 21396882.

The previous prime is 21396871. The next prime is 21396887. The reversal of 21396883 is 38869312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21396883 - 2¹³ = 21388691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21396887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10698441 + 10698442.

It is an arithmetic number, because the mean of its divisors is an integer number (10698442).

Almost surely, 2^21396883 is an apocalyptic number.

21396883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21396883 is an equidigital number, since it uses as much as digits as its factorization.

21396883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 21396883 is about 4625.6764910659. The cubic root of 21396883 is about 277.6196297234.

The spelling of 21396883 in words is "twenty-one million, three hundred ninety-six thousand, eight hundred eighty-three".