21214401242 has 8 divisors (see below), whose sum is σ = 31826010996. Its totient is φ = 10605730912.

The previous prime is 21214401239. The next prime is 21214401259. The reversal of 21214401242 is 24210441212.

It can be written as a sum of positive squares in 2 ways, for example, as 18534371881 + 2680029361 = 136141^2 + 51769^2 .

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

It is a super-2 number, since 2×21214401242² (a number of 21 digits) contains 22 as substring.

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, 716723 + ... + 745734.

Almost surely, 2^21214401242 is an apocalyptic number.

21214401242 is a deficient number, since it is larger than the sum of its proper divisors (10611609754).

21214401242 is a wasteful number, since it uses less digits than its factorization.

21214401242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469712.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21214401242 its reverse (24210441212), we get a palindrome (45424842454).

The spelling of 21214401242 in words is "twenty-one billion, two hundred fourteen million, four hundred one thousand, two hundred forty-two".