21333887 has 2 divisors, whose sum is σ = 21333888. Its totient is φ = 21333886.

The previous prime is 21333883. The next prime is 21333901. The reversal of 21333887 is 78833312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21333887 - 2² = 21333883 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21333881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666943 + 10666944.

It is an arithmetic number, because the mean of its divisors is an integer number (10666944).

Almost surely, 2^21333887 is an apocalyptic number.

21333887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333887 is an equidigital number, since it uses as much as digits as its factorization.

21333887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 21333887 is about 4618.8620893029. The cubic root of 21333887 is about 277.3469090384.

The spelling of 21333887 in words is "twenty-one million, three hundred thirty-three thousand, eight hundred eighty-seven".