21422434436 has 12 divisors (see below), whose sum is σ = 40373049612. Its totient is φ = 9887277408.

The previous prime is 21422434421. The next prime is 21422434457. The reversal of 21422434436 is 63443422412.

It can be written as a sum of positive squares in 2 ways, for example, as 3907500100 + 17514934336 = 62510^2 + 132344^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21422434396 and 21422434405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205984895 + ... + 205984998.

It is an arithmetic number, because the mean of its divisors is an integer number (3364420801).

Almost surely, 2^21422434436 is an apocalyptic number.

21422434436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21422434436 is a deficient number, since it is larger than the sum of its proper divisors (18950615176).

21422434436 is a wasteful number, since it uses less digits than its factorization.

21422434436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411969910 (or 411969908 counting only the distinct ones).

The product of its digits is 110592, while the sum is 35.

Adding to 21422434436 its reverse (63443422412), we get a palindrome (84865856848).

The spelling of 21422434436 in words is "twenty-one billion, four hundred twenty-two million, four hundred thirty-four thousand, four hundred thirty-six".