21722454419 has 2 divisors, whose sum is σ = 21722454420. Its totient is φ = 21722454418.

The previous prime is 21722454409. The next prime is 21722454421. The reversal of 21722454419 is 91445422712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21722454419 - 2⁸ = 21722454163 is a prime.

It is a super-2 number, since 2×21722454419² (a number of 21 digits) contains 22 as substring.

Together with 21722454421, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21722454409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10861227209 + 10861227210.

It is an arithmetic number, because the mean of its divisors is an integer number (10861227210).

Almost surely, 2^21722454419 is an apocalyptic number.

21722454419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21722454419 is an equidigital number, since it uses as much as digits as its factorization.

21722454419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The spelling of 21722454419 in words is "twenty-one billion, seven hundred twenty-two million, four hundred fifty-four thousand, four hundred nineteen".