21623393419 has 2 divisors, whose sum is σ = 21623393420. Its totient is φ = 21623393418.

The previous prime is 21623393417. The next prime is 21623393461. The reversal of 21623393419 is 91439332612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21623393419 - 2¹ = 21623393417 is a prime.

It is a super-2 number, since 2×21623393419² (a number of 21 digits) contains 22 as substring.

Together with 21623393417, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21623393417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811696709 + 10811696710.

It is an arithmetic number, because the mean of its divisors is an integer number (10811696710).

Almost surely, 2^21623393419 is an apocalyptic number.

21623393419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21623393419 is an equidigital number, since it uses as much as digits as its factorization.

21623393419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 43.

The spelling of 21623393419 in words is "twenty-one billion, six hundred twenty-three million, three hundred ninety-three thousand, four hundred nineteen".