21155435419 has 2 divisors, whose sum is σ = 21155435420. Its totient is φ = 21155435418.

The previous prime is 21155435393. The next prime is 21155435423. The reversal of 21155435419 is 91453455112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21155435419 - 2²⁷ = 21021217691 is a prime.

It is a super-2 number, since 2×21155435419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21155435219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577717709 + 10577717710.

It is an arithmetic number, because the mean of its divisors is an integer number (10577717710).

Almost surely, 2^21155435419 is an apocalyptic number.

21155435419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155435419 is an equidigital number, since it uses as much as digits as its factorization.

21155435419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 40.

The spelling of 21155435419 in words is "twenty-one billion, one hundred fifty-five million, four hundred thirty-five thousand, four hundred nineteen".