21404334024242 has 16 divisors (see below), whose sum is σ = 34597562139672. Its totient is φ = 9872829037440.

The previous prime is 21404334024239. The next prime is 21404334024277. The reversal of 21404334024242 is 24242043340412.

It can be written as a sum of positive squares in 4 ways, for example, as 18012036795481 + 3392297228761 = 4244059^2 + 1841819^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253888643 + ... + 253972934.

Almost surely, 2^{21404334024242} is an apocalyptic number.

21404334024242 is a deficient number, since it is larger than the sum of its proper divisors (13193228115430).

21404334024242 is a wasteful number, since it uses less digits than its factorization.

21404334024242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507863213.

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 21404334024242 its reverse (24242043340412), we get a palindrome (45646377364654).

The spelling of 21404334024242 in words is "twenty-one trillion, four hundred four billion, three hundred thirty-four million, twenty-four thousand, two hundred forty-two".