21421343042 has 8 divisors (see below), whose sum is σ = 35053106832. Its totient is φ = 9736974100.

The previous prime is 21421343023. The next prime is 21421343101. The reversal of 21421343042 is 24034312412.

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

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, 486848684 + ... + 486848727.

It is an arithmetic number, because the mean of its divisors is an integer number (4381638354).

Almost surely, 2^21421343042 is an apocalyptic number.

21421343042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21421343042 is a deficient number, since it is larger than the sum of its proper divisors (13631763790).

21421343042 is a wasteful number, since it uses less digits than its factorization.

21421343042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973697424.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21421343042 its reverse (24034312412), we get a palindrome (45455655454).

It can be divided in two parts, 21421 and 343042, that added together give a palindrome (364463).

The spelling of 21421343042 in words is "twenty-one billion, four hundred twenty-one million, three hundred forty-three thousand, forty-two".