21733219 has 2 divisors, whose sum is σ = 21733220. Its totient is φ = 21733218.

The previous prime is 21733193. The next prime is 21733241. The reversal of 21733219 is 91233712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21733219 - 2¹³ = 21725027 is a prime.

It is a super-2 number, since 2×21733219² = 944665616203922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21733249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10866609 + 10866610.

It is an arithmetic number, because the mean of its divisors is an integer number (10866610).

Almost surely, 2^21733219 is an apocalyptic number.

21733219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21733219 is an equidigital number, since it uses as much as digits as its factorization.

21733219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 21733219 is about 4661.8900673439. The cubic root of 21733219 is about 279.0667012493.

It can be divided in two parts, 21733 and 219, that added together give a cube (21952 = 28³).

The spelling of 21733219 in words is "twenty-one million, seven hundred thirty-three thousand, two hundred nineteen".