21403242042410 has 16 divisors (see below), whose sum is σ = 38546360928936. Its totient is φ = 8556735649728.

The previous prime is 21403242042373. The next prime is 21403242042473. The reversal of 21403242042410 is 1424024230412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17300749779889 + 4102492262521 = 4159417^2 + 2025461^2 .

It is a Curzon number.

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, 570126197 + ... + 570163736.

Almost surely, 2^{21403242042410} is an apocalyptic number.

21403242042410 is a deficient number, since it is larger than the sum of its proper divisors (17143118886526).

21403242042410 is a wasteful number, since it uses less digits than its factorization.

21403242042410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140291817.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21403242042410 its reverse (1424024230412), we get a palindrome (22827266272822).

The spelling of 21403242042410 in words is "twenty-one trillion, four hundred three billion, two hundred forty-two million, forty-two thousand, four hundred ten".