21443421042 has 48 divisors (see below), whose sum is σ = 48529585728. Its totient is φ = 6830149920.

The previous prime is 21443421037. The next prime is 21443421101. The reversal of 21443421042 is 24012434412.

21443421042 is a `hidden beast` number, since 2 + 1 + 443 + 4 + 210 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21443420997 and 21443421015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393817 + ... + 444947.

It is an arithmetic number, because the mean of its divisors is an integer number (1011033036).

Almost surely, 2^21443421042 is an apocalyptic number.

21443421042 is an abundant number, since it is smaller than the sum of its proper divisors (27086164686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21443421042 is a wasteful number, since it uses less digits than its factorization.

21443421042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52175 (or 52172 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21443421042 its reverse (24012434412), we get a palindrome (45455855454).

The spelling of 21443421042 in words is "twenty-one billion, four hundred forty-three million, four hundred twenty-one thousand, forty-two".