21435535642 has 8 divisors (see below), whose sum is σ = 32211030996. Its totient is φ = 10698525312.

The previous prime is 21435535613. The next prime is 21435535643. The reversal of 21435535642 is 24653553412.

It can be written as a sum of positive squares in 2 ways, for example, as 20053108881 + 1382426761 = 141609^2 + 37181^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21435535595 and 21435535604.

It is not an unprimeable number, because it can be changed into a prime (21435535643) by changing a digit.

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, 9619863 + ... + 9622090.

Almost surely, 2^21435535642 is an apocalyptic number.

21435535642 is a deficient number, since it is larger than the sum of its proper divisors (10775495354).

21435535642 is a wasteful number, since it uses less digits than its factorization.

21435535642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19242512.

The product of its digits is 432000, while the sum is 40.

The spelling of 21435535642 in words is "twenty-one billion, four hundred thirty-five million, five hundred thirty-five thousand, six hundred forty-two".