21778363441 has 12 divisors (see below), whose sum is σ = 22794536128. Its totient is φ = 20805750504.

The previous prime is 21778363427. The next prime is 21778363459. The reversal of 21778363441 is 14436387712.

It is not a de Polignac number, because 21778363441 - 2²³ = 21769974833 is a prime.

It is a super-2 number, since 2×21778363441² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21778363391 and 21778363400.

It is not an unprimeable number, because it can be changed into a prime (21778333441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410356 + ... + 460378.

Almost surely, 2^21778363441 is an apocalyptic number.

It is an amenable number.

21778363441 is a deficient number, since it is larger than the sum of its proper divisors (1016172687).

21778363441 is an equidigital number, since it uses as much as digits as its factorization.

21778363441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50892 (or 50869 counting only the distinct ones).

The product of its digits is 677376, while the sum is 46.

The spelling of 21778363441 in words is "twenty-one billion, seven hundred seventy-eight million, three hundred sixty-three thousand, four hundred forty-one".