21440222042 has 8 divisors (see below), whose sum is σ = 32413564416. Its totient is φ = 10635700572.

The previous prime is 21440222033. The next prime is 21440222071. The reversal of 21440222042 is 24022204412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21440221999 and 21440222017.

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, 42204908 + ... + 42205415.

It is an arithmetic number, because the mean of its divisors is an integer number (4051695552).

Almost surely, 2^21440222042 is an apocalyptic number.

21440222042 is a deficient number, since it is larger than the sum of its proper divisors (10973342374).

21440222042 is a wasteful number, since it uses less digits than its factorization.

21440222042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84410452.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 21440222042 its reverse (24022204412), we get a palindrome (45462426454).

The spelling of 21440222042 in words is "twenty-one billion, four hundred forty million, two hundred twenty-two thousand, forty-two".