21003440422 has 8 divisors (see below), whose sum is σ = 31542714000. Its totient is φ = 10489202424.

The previous prime is 21003440407. The next prime is 21003440459. The reversal of 21003440422 is 22404430012.

It is a happy number.

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

It is a super-2 number, since 2×21003440422² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003440393 and 21003440402.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6256797 + ... + 6260152.

It is an arithmetic number, because the mean of its divisors is an integer number (3942839250).

Almost surely, 2^21003440422 is an apocalyptic number.

21003440422 is a deficient number, since it is larger than the sum of its proper divisors (10539273578).

21003440422 is a wasteful number, since it uses less digits than its factorization.

21003440422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12517790.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21003440422 its reverse (22404430012), we get a palindrome (43407870434).

The spelling of 21003440422 in words is "twenty-one billion, three million, four hundred forty thousand, four hundred twenty-two".