21054444419 has 2 divisors, whose sum is σ = 21054444420. Its totient is φ = 21054444418.

The previous prime is 21054444401. The next prime is 21054444451. The reversal of 21054444419 is 91444445012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21054444419 - 2³² = 16759477123 is a prime.

It is a super-2 number, since 2×21054444419² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21054446419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527222209 + 10527222210.

It is an arithmetic number, because the mean of its divisors is an integer number (10527222210).

Almost surely, 2^21054444419 is an apocalyptic number.

21054444419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054444419 is an equidigital number, since it uses as much as digits as its factorization.

21054444419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 21054444419 in words is "twenty-one billion, fifty-four million, four hundred forty-four thousand, four hundred nineteen".